Year: 2014

Fire HD Kids Edition Tablet: Educational Review

Fire HD Kids Edition Tablet
Shop Amazon – Introducing Fire HD Kids Edition – Everything Kids Love. Everything Parents Want.

As an Amazon Affiliate, Mathtuition88 is proud to introduce the Fire HD Kids Edition:

All-new Fire HD tablet—with 1 year of Amazon FreeTime Unlimited, Kid-Proof Case, and a 2-year worry-free guarantee—up to $95 in savings
  • A real tablet, not a toy—A quad-core processor for great performance, a vivid HD display, front and rear-facing cameras, and Dolby Digital Audio
  • Built for even the toughest kids—Enjoy the peace of mind with an unprecedented 2-year worry-free guarantee—if they break it, we’ll replace it for free. No questions asked
  • Don’t worry about the bill—The Kids Edition includes a year of Amazon FreeTime Unlimited so kids get unlimited access to 5,000 books, movies, TV shows, educational apps, and games—at no additional cost.
  • Best-in-class parental controls—Create individual profiles for each of your children. Personalize screen time limits, educational goals, and age-appropriate content
  • Kid-Proof Case—Durable, lightweight case to protect against drops and bumps caused by kids at play.

This is a potential good alternative to the Ipad. Ipad is more for games, while the Fire HD Kids Edition Tablet is more educational, with a hand-curated subscription of over 5,000 kid-friendly books, movies, TV shows, educational apps, and games.

It will be out soon this October 2014! Pre-order now by clicking this link: Click here to Pre-order.

What are Friedman numbers?

What are Friedman numbers? Watch this video to find out!

Most amazing thing is that as numbers get bigger, the likelihood that they are Friedman numbers actually increase! (Friedman numbers have “density one”!)

Featured book:

First Steps for Math Olympians: Using the American Mathematics Competitions (Problem Books) (MAA Problem Book Series)

Any high school student preparing for the American Mathematics Competitions should get their hands on a copy of this book! A major aspect of mathematical training and its benefit to society is the ability to use logic to solve problems. The American Mathematics Competitions (AMC) have been given for more than fifty years to millions of high school students. This book considers the basic ideas behind the solutions to the majority of these problems, and presents examples and exercises from past exams to illustrate the concepts. Anyone taking the AMC exams or helping students prepare for them will find many useful ideas here. But people generally interested in logical problem solving should also find the problems and their solutions interesting. This book will promote interest in mathematics by providing students with the tools to attack problems that occur on mathematical problem-solving exams, and specifically to level the playing field for those who do not have access to the enrichment programs that are common at the top academic high schools. The book can be used either for self-study or to give people who want to help students prepare for mathematics exams easy access to topic-oriented material and samples of problems based on that material. This is useful for teachers who want to hold special sessions for students, but it is equally valuable for parents who have children with mathematical interest and ability. As students’ problem solving abilities improve, they will be able to comprehend more difficult concepts requiring greater mathematical ingenuity. They will be taking their first steps towards becoming math Olympians!

Carnival of Mathematics

Mathtuition88.com will be the host of the next Carnival of Mathematics! (Submission site: http://www.aperiodical.com/carnival-of-mathematics)

I will now be receiving submissions for Carnival 115.

Firstly, let’s have a discussion on what is so special about the number 115. David Brooks has kindly provided a PDF (Input for Carnival of Math) which the following information is sourced from.

The “Mathematical Association of America” (http://maanumberaday.blogspot.com/2009/11/115.html) notes that:

115 = 5 x 23.

115 = 23 x (2 + 3).

115 has a unique representation as a sum of three squares: 32 + 52 + 92 = 115.

115 is the smallest three-digit integer, abc, such that (abc)/(a*b*c) is prime: 115/5 = 23.

STS-115 was a space shuttle mission to the International Space Station flown by the space shuttle Atlantis on Sept. 9, 2006.

Some other interesting Trivia about 115 include:

115 is the emergency telephone number when calling in Iran. 🙂

115 is the number of cardinals who actually participated to vote for the 265th Pope succeeding the Pope John Paul II in April 2005, even though 117 cardinals were eligible.

Featured posts:

1) How Many Colored Tetrominoes?

Permalink URL:
http://mrburkemath.blogspot.com/2014/09/how-many-colored-tetrominoes.html

Title of post:
How Many Colored Tetrominoes?

Post Author:
Christopher J. Burke

This is a very interesting link about tetrominoes! If you are not sure what are tetrominoes, it is perfectly ok! Just go to the website link above and you will find out!

Question: How many different colored tetrominoes are there if we allow only four colors total?

Second question: What the heck is a tetromino?

Dominoes are a great game with rectangle tiles, composed of two adjacent squares with certain numbers of pips on them. A tetromino is a group of four adjacent squares, each sharing at least one side with at least one other square. In other words, those little falling shapes made popular in the game Tetris, and all of its knock-off variations, as seen below:

tetromino

2) Using expected frequencies when teaching probability

Summary: The use of the term ‘expected frequencies’ is novel and not widely known in mathematics education. The basic idea is very simple: instead of saying “the probability of X is 0.20 (or 20%)”, we would say “out of 100 situations like this, we would expect X to occur 20 times”.

To learn about this more intuitive and novel way of using expected frequencies to teach probability, visit the site at http://understandinguncertainty.org/using-expected-frequencies-when-teaching-probability.

3) Kettle and Cake Logic

Sigmund Freud tells the tale of a man accused of breaking his neighbour’s kettle. He mounts a three-stranded defence :

1. “I never borrowed it in the first place!”
2. “And anyway it was already broken when I did!”
3. “In any case, it was fine when I returned it!”

Freud used this as an example of the inconsistent logic of dreamland, although you won’t have to look too far afield in the waking world to find examples of similar reasoning[1].

Sounds interesting? View it at: https://plus.google.com/app/basic/stream/z13swvoqnzeyxtbep22fwvqoaxjlefohb04

4) Math Circle – Billiards

From Math Circle: The reason I picked billiards to feature at this particular moment is because twoof this year’s Fields Medalists study billiards: Maryam Mirzakhani and Artur Avila. To find out more about these amazing mathematicians, see our recent Math Munch post.

Visit http://ichoosemath.com/2014/09/14/math-circle-billiards/ to learn more!

5) The curious reluctance to define prime probability logically

The curious reluctance to define prime probability logically. The title says it all, except stress the point that we need to encourage more reasoning from first principles based on what we individually accept as self-evident, and not on what others believe to be self-evident.

6) Hailstone numbers shape a poem

By : One of my favorite mathy poets is Halifax mathematician Robert Dawson — his work is complex and inventive, and fun to puzzle over.  Dawson’s webpage at St Mary’s University lists his mathematical activity; his poetry and fiction are available in several issues of the Journal of Humanistic Mathematics and in several postings for this blog (15 April 2012,  30 November 2013, 2 March 2014) and in various other locations findable by Google.
Can a poem be written by following a formula?  Despite the tendency of most of us to say NO to this question we also may admit to the fact that a formula applied to words can lead to arrangements and thoughts not possible for us who write from our own learning and experiences.  How else to be REALLY NEW but to try a new method? Set a chimpanzee at a typewriter or apply a mathematical formula.
Below we offer Dawson’s “Hailstone” and follow it with his explanation of how mathematics shaped the poem from its origin as a “found passage” from the beginning of Dickens’ Great Expectations.

Read more at: http://poetrywithmathematics.blogspot.co.uk/2014/09/hailstone-numbers-shape-poem.html?m=1

7) Approximating e using the digits 1–9

Read this article to learn how to approximate e using just the digitis 1-9! ((1 + 9^{–4^{7×6}})^{3^{2^{85}}}. ) Learn how it works and how remarkably accurate it is! The post is written by Richard Green.

Another closely related post is http://www.flyingcoloursmaths.co.uk/estimating-e/ by Flying Colours Maths Blog!

8）Sand Hill-bert Curve

IMG_20140917_190333

What is this about? It is a sand model of the Hilbert Curve, or Hilbert space-filling curve!

Check out http://blog.andreahawksley.com/sand-hill-bert-curve/ to learn more.

9)  Decending powers of x

I was in one of my colleagues lessons this week.and he was teaching the class to expand quadratic brackets. As the lesson went on he noticed that a number of pupils had been writing the X squared term, then the constant term then the X term so he pulled the class together to tell them that conventionally we write quadratic equations in decending powers of x. This is excellent practice and something we all should be encouraging, but it made me think “Why decending powers of x?”

Interesting question to ponder!

Read more at: http://cavmaths.wordpress.com/2014/09/26/decending-powers-of-x/

10) Extrapolation Gone Wrong: the Case of the Fermat Primes

Read more at: http://blogs.scientificamerican.com/roots-of-unity/2014/09/26/extrapolation-gone-wrong-the-case-of-the-fermat-primes/

11) Erica Klarreich Profiles an Award-Winning Mathematician

Erica Klarreich interviews a famous recent Fields Medallist Stanford University professor Maryam Mirzakhani at: http://www.theopennotebook.com/2014/09/30/erica-klarreich-profiles-an-award-winning-mathematician/

12) Will Rogers phenomenon

Check out the interesting Will Rogers phenomenon, with application to managing a football team! (http://mathsball.blogspot.com.es/2014/09/impossible-transfer-will-rogers-phenomenon.html)

Featured book:

Math Doesn’t Suck: How to Survive Middle School Math Without Losing Your Mind or Breaking a Nail

From a well-known actress, math genius and popular contestant on “Dancing With The Stars”—a groundbreaking guide to mathematics for middle school girls, their parents, and educators

Learning Pyramid (How to Learn Maths)

learning_pyramid

The best way to learn maths is actually to teach others. The second best way to learn maths is to practice doing it!

Featured book:

Math Doesn’t Suck: How to Survive Middle School Math Without Losing Your Mind or Breaking a Nail

From a well-known actress, math genius and popular contestant on “Dancing With The Stars”—a groundbreaking guide to mathematics for middle school girls, their parents, and educators

As the math education crisis in this country continues to make headlines, research continues to prove that it is in middle school when math scores begin to drop—especially for girls—in large part due to the relentless social conditioning that tells girls they “can’t do” math, and that math is “uncool.” Young girls today need strong female role models to embrace the idea that it’s okay to be smart—in fact, it’s sexy to be smart!

It’s Danica McKellar’s mission to be this role model, and demonstrate on a large scale that math doesn’t suck. In this fun and accessible guide, McKellar—dubbed a “math superstar” by The New York Times—gives girls and their parents the tools they need to master the math concepts that confuse middle-schoolers most, including fractions, percentages, pre-algebra, and more. The book features hip, real-world examples, step-by-step instruction, and engaging stories of Danica’s own childhood struggles in math (and stardom). In addition, borrowing from the style of today’s teen magazines, it even includes a Math Horoscope section, Math Personality Quizzes, and Real-Life Testimonials—ultimately revealing why math is easier and cooler than readers think.

 

Inequality Olympiad Question and Solution

Let a, b, c be nonnegative real numbers satisfying a^2+b^2+c^2=1. Prove that

\sqrt{a+b}+\sqrt{b+c}+\sqrt{c+a}\geq\sqrt{7(a+b+c)-3}

Source: http://www.fen.bilkent.edu.tr/~cvmath/Problem/1408a.pdf

 

Featured book:

Inequalities: A Mathematical Olympiad Approach

This book is intended for the Mathematical Olympiad students who wish to prepare for the study of inequalities, a topic now of frequent use at various levels of mathematical competitions. In this volume we present both classic inequalities and the more useful inequalities for confronting and solving optimization problems. An important part of this book deals with geometric inequalities and this fact makes a big difference with respect to most of the books that deal with this topic in the mathematical olympiad. The book has been organized in four chapters which have each of them a different character. Chapter 1 is dedicated to present basic inequalities. Most of them are numerical inequalities generally lacking any geometric meaning. However, where it is possible to provide a geometric interpretation, we include it as we go along. We emphasize the importance of some of these inequalities, such as the inequality between the arithmetic mean and the geometric mean, the Cauchy-Schwarz inequality, the rearrangementinequality, the Jensen inequality, the Muirhead theorem, among others. For all these, besides giving the proof, we present several examples that show how to use them in mathematical olympiad problems. We also emphasize how the substitution strategy is used to deduce several inequalities.

 

A Journey of Mathematics 数学之旅

tomcircle's avatarMath Online Tom Circle

Excellent free course for non mathematicians.

This Philosophical Math course has started half way but past videos are still hosted on the site.

The course is taught by prof Wang of Shanghai Jiaotong Technology University上海交通大学 (SJT), the Alma Mata of former China President Jiang (江泽民), Prime minister Chu (朱镕基), and Prof Qian XueSheng (钱学森) “The Father of Chinese Space and Missile” (China exchanged his country home return with USA FBI for 4 American generals from Korean War prisoners of War) who sent Chinese Taikongnauts (太空人) to space. 

SJT was formed initially as the ‘Classe Préparatoire’ (Bachelor degree, post-High school Prep-college) for graduate engineering to MIT,  while Qing Hua 清华 University was a prep-college for graduate Science/ Math to Harvard, Chicago, Cornell,  etc.

Go to Lesson 3: He explains from a game of Go what is “Space” in maths: Geometrical n-dimensional Space, Linear space, vector space.. why study functional space (in  which…

View original post 281 more words

A Simple Brain Theory Endorsed By Bill Gates Claims To Help You Learn Anything

Source: http://www.businessinsider.sg/carol-dwecks-growth-mindset-theory-tweeted-by-bill-gates-2014-8/#.VAxnTPmSx8E

A small psychological change to how we approach challenges can drastically change how successful we are at these tasks.

That’s according to Carol Dweck, a psychology professor at Stanford University, who coined the term “growth mindset” in her 2007 book “Mindset: The New Psychology of Success.”

Microsoft magnate Bill Gates tweeted a video of Dweck explaining the growth mindset earlier this week:

Featured book:

Mindset: The New Psychology of Success

World-renowned Stanford University psychologist Carol Dweck, in decades of research on achievement and success, has discovered a truly groundbreaking idea–the power of our mindset.

Dweck explains why it’s not just our abilities and talent that bring us success–but whether we approach them with a fixed or growth mindset. She makes clear why praising intelligence and ability doesn’t foster self-esteem and lead to accomplishment, but may actually jeopardize success. With the right mindset, we can motivate our kids and help them to raise their grades, as well as reach our own goals–personal and professional. Dweck reveals what all great parents, teachers, CEOs, and athletes already know: how a simple idea about the brain can create a love of learning and a resilience that is the basis of great accomplishment in every area.

Stable Marriage Problem – Numberphile

This is an interesting problem in the topic of combinatorics and graph theory. It can be phrased in the context of arranging stable marriages.

Nice animation and clear explanation! Watch part 2 too for the mathematical explanation.

Featured book:

A Mind For Numbers: How to Excel at Math and Science (Even If You Flunked Algebra)

Whether you are a student struggling to fulfill a math or science requirement, or you are embarking on a career change that requires a higher level of math competency, A Mind for Numbers offers the tools you need to get a better grasp of that intimidating but inescapable field. Engineering professor Barbara Oakley knows firsthand how it feels to struggle with math. She flunked her way through high school math and science courses, before enlisting in the army immediately after graduation. When she saw how her lack of mathematical and technical savvy severely limited her options—both to rise in the military and to explore other careers—she returned to school with a newfound determination to re-tool her brain to master the very subjects that had given her so much trouble throughout her entire life.

In A Mind for Numbers, Dr. Oakley lets us in on the secrets to effectively learning math and science—secrets that even dedicated and successful students wish they’d known earlier. Contrary to popular belief, math requires creative, as well as analytical, thinking. Most people think that there’s only one way to do a problem, when in actuality, there are often a number of different solutions—you just need the creativity to see them. For example, there are more than three hundred different known proofs of the Pythagorean Theorem. In short, studying a problem in a laser-focused way until you reach a solution is not an effective way to learn math. Rather, it involves taking the time to step away from a problem and allow the more relaxed and creative part of the brain to take over. A Mind for Numbers shows us that we all have what it takes to excel in math, and learning it is not as painful as some might think!

 

 

How to subtract 12 from 32? (The Common Core Way)

This is an incredibly complicated way to evaluate 32-12.

One wonders if this is a step backward in education.

As Einstein said,  “Everything should be made as simple as possible, but not simpler”.

einstein quote

Featured book:

A Mind For Numbers: How to Excel at Math and Science (Even If You Flunked Algebra)

Whether you are a student struggling to fulfill a math or science requirement, or you are embarking on a career change that requires a higher level of math competency, A Mind for Numbers offers the tools you need to get a better grasp of that intimidating but inescapable field. Engineering professor Barbara Oakley knows firsthand how it feels to struggle with math. She flunked her way through high school math and science courses, before enlisting in the army immediately after graduation. When she saw how her lack of mathematical and technical savvy severely limited her options—both to rise in the military and to explore other careers—she returned to school with a newfound determination to re-tool her brain to master the very subjects that had given her so much trouble throughout her entire life.

In A Mind for Numbers, Dr. Oakley lets us in on the secrets to effectively learning math and science—secrets that even dedicated and successful students wish they’d known earlier. Contrary to popular belief, math requires creative, as well as analytical, thinking. Most people think that there’s only one way to do a problem, when in actuality, there are often a number of different solutions—you just need the creativity to see them. For example, there are more than three hundred different known proofs of the Pythagorean Theorem. In short, studying a problem in a laser-focused way until you reach a solution is not an effective way to learn math. Rather, it involves taking the time to step away from a problem and allow the more relaxed and creative part of the brain to take over. A Mind for Numbers shows us that we all have what it takes to excel in math, and learning it is not as painful as some might think!

A Basic Multiplication Question (Common Mistake)

Site: http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=29&t=71476&p=1377930#p1377930

HermioneGranger wrote:

Hi, a desperate question.In solutions of equation, when you multiply 2(2) by two, why is the answer 2(4) and not 4(4)?

TIA :)

Answer: 
Good question!

The theoretical reason is that if we multiply a product a(b) by two, we are actually having two copies of a(b).

Hence, 2 x a(b)= 2 times of a(b) = 2a(b) = a(2b)

For a concrete example, think about what would happen if we multiply 1(1)(1)(1)(1) by 2.

1(1)(1)(1)(1) is just 1, hence the answer should be 1(1)(1)(1)(2)=2, and not 2(2)(2)(2)(2) which is 32.

Featured book:

Math Doesn’t Suck: How to Survive Middle School Math Without Losing Your Mind or Breaking a Nail

Free Coursera Course: An Introduction to Functional Analysis

Site: https://www.coursera.org/course/functionalanalysis

There is an interesting upcoming course at Coursera, suitable for undergraduates! (Starting 12 September 2014) Join the class if interested, it is free! Functional Analysis is actually a third year course for Math Majors at university. There are some powerful and deep theorems in functional analysis, like the Riesz representation theorem.

About the Course

Functional analysis is the branch of mathematics dealing with spaces of functions. It is a valuable tool in theoretical mathematics as well as engineering. It is at the very core of numerical simulation.

In this class, I will explain the concepts of convergence and talk about topology. You will understand the difference between strong convergence and weak convergence. You will also see how these two concepts can be used.

You will learn about different types of spaces including metric spaces, Banach Spaces, Hilbert Spaces and what property can be expected. You will see beautiful lemmas and theorems such as Riesz and Lax-Milgram and I will also describe Lp spaces, Sobolev spaces and provide a few details about PDEs, or Partial Differential Equations.

Course Syllabus

Week 1: Topology; continuity and convergence of a sequence in a topological space.
Week 2: Metric and normed spaces; completeness
Week 3: Banach spaces; linear continuous functions; weak topology
Week 4: Hilbert spaces; The Riesz representation theorem
Week 5: The Lax-Milgram Lemma
Week 6: Properties of the Lp spaces
Week 7: Distributions and Sobolev Spaces
Week 8: Application: simulating a membrane

Recommended Background

The course is mostly self-contained; however, you need to be familiar with functions, derivatives and integrals. You need to know what A ∩ B means and to know what a proof is. You should be fine if you have taken Calculus II and Algebra II. Students in Europe who have taken 120 ECTS in science should be fine as well.

Because this is an online class, having advanced and non-advanced students in a class will not be a problem; on the contrary we expect a wide range of interesting interactions. However, non-advanced students may have to work a bit more.

Course Format

The class will consist of a series of lecture videos, usually between five and twelve minutes in length.  There will be approximately one hour worth of video content per week. Some of the videos contain integrated quiz questions. There will also be standalone quizzes that are not part of the video lectures; you will be asked to solve some problems and evaluate the solutions proposed by your fellow classmates. There will be a final exam.

There will be some additional contents in the form of PDF files.

FAQ

  • Will I get a Statement of Accomplishment after completing this class?
    Yes. Students who successfully complete the class will receive a Statement of Accomplishment signed by the instructor.
  • What resources will I need for this class?
    For this course, all you need is an Internet connection and the time to view the videos, understand the material, discuss the material with fellow classmates, take the quizzes and solve the problems.
  • What pedagogy will be used?
    This MOOC is in English but the math will be taught with a “French Touch”.
  • What does “teaching math with a French touch” mean?
    France has a long-standing tradition where math is addressed from a theoretical standpoint and studied for its implicit value throughout high school and preparatory school for the high-level entrance exams. This leads to a mindset based on proofs and abstraction. This mindset has consequences on problem solving that is sometimes referred to as the “French Engineer”. In contrast, other countries have a tradition where math is addressed as a computation tool.
  • Does it mean it will abstract and complicated?
    The approach will be rather abstract but I will be sure to emphasize the concepts over the technicalities. Above all, my aim is to help you understand the material and the beauty behind it.

Featured book:

Introductory Functional Analysis with Applications

This is the recommended textbook that covers the material in the Coursera Course (and more).

Happy Teacher’s Day!

Glad to receive some Teacher’s Day cards and presents from my students!

teacher's day cardWishing all teachers a happy Teacher’s Day this Friday, and also wishing students all the best for their upcoming exams.

Featured book:

A Mind For Numbers: How to Excel at Math and Science (Even If You Flunked Algebra)

Whether you are a student struggling to fulfill a math or science requirement, or you are embarking on a career change that requires a higher level of math competency, A Mind for Numbers offers the tools you need to get a better grasp of that intimidating but inescapable field. Engineering professor Barbara Oakley knows firsthand how it feels to struggle with math. She flunked her way through high school math and science courses, before enlisting in the army immediately after graduation. When she saw how her lack of mathematical and technical savvy severely limited her options—both to rise in the military and to explore other careers—she returned to school with a newfound determination to re-tool her brain to master the very subjects that had given her so much trouble throughout her entire life.

In A Mind for Numbers, Dr. Oakley lets us in on the secrets to effectively learning math and science—secrets that even dedicated and successful students wish they’d known earlier. Contrary to popular belief, math requires creative, as well as analytical, thinking. Most people think that there’s only one way to do a problem, when in actuality, there are often a number of different solutions—you just need the creativity to see them. For example, there are more than three hundred different known proofs of the Pythagorean Theorem. In short, studying a problem in a laser-focused way until you reach a solution is not an effective way to learn math. Rather, it involves taking the time to step away from a problem and allow the more relaxed and creative part of the brain to take over. A Mind for Numbers shows us that we all have what it takes to excel in math, and learning it is not as painful as some might think!

A Mind For Numbers: How to Excel at Math and Science (Even If You Flunked Algebra)

Featured book:

A Mind For Numbers: How to Excel at Math and Science (Even If You Flunked Algebra)

Whether you are a student struggling to fulfill a math or science requirement, or you are embarking on a career change that requires a higher level of math competency, A Mind for Numbers offers the tools you need to get a better grasp of that intimidating but inescapable field. Engineering professor Barbara Oakley knows firsthand how it feels to struggle with math. She flunked her way through high school math and science courses, before enlisting in the army immediately after graduation. When she saw how her lack of mathematical and technical savvy severely limited her options—both to rise in the military and to explore other careers—she returned to school with a newfound determination to re-tool her brain to master the very subjects that had given her so much trouble throughout her entire life.

In A Mind for Numbers, Dr. Oakley lets us in on the secrets to effectively learning math and science—secrets that even dedicated and successful students wish they’d known earlier. Contrary to popular belief, math requires creative, as well as analytical, thinking. Most people think that there’s only one way to do a problem, when in actuality, there are often a number of different solutions—you just need the creativity to see them. For example, there are more than three hundred different known proofs of the Pythagorean Theorem. In short, studying a problem in a laser-focused way until you reach a solution is not an effective way to learn math. Rather, it involves taking the time to step away from a problem and allow the more relaxed and creative part of the brain to take over. A Mind for Numbers shows us that we all have what it takes to excel in math, and learning it is not as painful as some might think!

Mathematician’s Job: High Pay but Lowest Stress

One good reason to study Mathematics – high pay Mathematician job and lowest stress, comparing with other high-pay-high-stress professionals.

tomcircle's avatarMath Online Tom Circle

image

High pay high stress ?

Not really true … among the top 17 high-paying jobs (yearly earning above US $100,000) in the USA, Mathematician’s job has the lowest stress below 60 (in the scale from 0 no stress to highest stress at 100).

image
image

Source:
http://www.businessinsider.sg/high-paying-low-stress-jobs-2014-7/9/#.VAYQrYEZ7qA

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Five things successful teachers do on the first day of class

math joke

Featured book:

Comic-Strip Math: Problem Solving: 80 Reproducible Cartoons With Dozens and Dozens of Story Problems That Motivate Students and Build Essential Math Skills

Math + Comics = Learning That’s Fun! Help students build essential math skills and meet math standards with 80 laugh-out-loud comic strips and companion mini-story problems. Each reproducible comic and problem set reinforces a key math skill: multiplication, division, fractions, decimals, measurement, geometry, and more. Great to use for small-group or independent class work and for homework! For use with Grades 3-6.

 

Funny Video about Math (and other) Majors

Featured book:

Math Jokes 4 Mathy Folks

Who says math can’t be funny? In Math Jokes 4 Mathy Folks, Patrick Vennebush dispels the myth of the humorless mathematician. His quick wit comes through in this incredible compilation of jokes and stories. Intended for all math types, Math Jokes 4 Mathy Folks provides a comprehensive collection of math humor, containing over 400 jokes. It’s a book that all teachers from elementary school through college should have in their library. But the humor isn’t just for the classroom-it also appeals to engineers, statisticians, and other math professionals searching for some good, clean, numerical fun. From basic facts (Why is 6 afraid of 7?) to trigonometry (Mathematical puns are the first sine of dementia) and algebra (Graphing rational functions is a pain in the asymptote), no topic is safe. As Professor Jim Rubillo notes, Math Jokes 4 Math Folks is an absolute gem for anyone dedicated to seeing mathematical ideas through puns, double meanings, and blatant bad jokes. Such perspectives help to see concepts and ideas in different and creative ways.

3×3 Matrix Inverse Shortcut (Fastest Method)

Source: http://www.math.columbia.edu/~bayer/LinearAlgebra/pdf/inverse.pdf

Backup copy (In case of broken link): 3×3 Matrix Inverse

This is an excellent method for finding the inverse of a 3×3 matrix, probably the fastest and easiest method for 3×3.

(Row reduction is better for 4×4 matrices and above.)

This method was first introduced to me by my student!

Featured book:

Linear Algebra and Its Applications, 4th Edition

ICM2014 Fields Medalist Manjul Bhargava

Correction (Thanks to Prof. Leong, see comments below):

“Manjul Bhargava’s PhD advisor is Andrew Wiles of Princeton University, not Benedict Gross. However, Bhargava is an undergraduate student of Gross in Harvard University.”

tomcircle's avatarMath Online Tom Circle

ICM2014 VideoSeries PL9: Manjul Bhargava:

(Part 1 of video – difficult part ): His PhD supervisor Benedict Gross (Harvard Math Dean) gave the laudation speech.

(Part 2 of video: Excellent and Understandable presentation) by the Fields medal 2014  receipient: the Canadian/American Indian Prof Manjul Bargarva.

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Education News: School Starts Too Early?

Source: http://www.scientificamerican.com/article/school-starts-too-early/?&WT.mc_id=SA_WR_20140827

School Starts Too Early

The later high school classes start in the morning, the more academic performance improves
Aug 19, 2014 |By Mark Fischetti
 

Parents, students and teachers often argue, with little evidence, about whether U.S. high schools begin too early in the morning. In the past three years, however, scientific studies have piled up, and they all lead to the same conclusion: a later start time improves learning. And the later the start, the better.Biological research shows that circadian rhythms shift during the teen years, pushing boys and girls to stay up later at night and sleep later into the morning. The phase shift, driven by a change in melatonin in the brain, begins around age 13, gets stronger by ages 15 and 16, and peaks at ages 17, 18 or 19.

Does that affect learning? It does, according to Kyla Wahlstrom, director of the Center for Applied Research and Educational Improvement at the University of Minnesota. She published a large study in February that tracked more than 9,000 students in eight public high schools in Minnesota, Colorado and Wyoming. After one semester, when school began at 8:35 a.m. or later, grades earned in math, English, science and social studies typically rose a quarter step—for example, up halfway from B to B+.

Read more at: http://www.scientificamerican.com/article/school-starts-too-early/?&WT.mc_id=SA_WR_20140827

You are welcome to leave your comments below!

Featured book:

How Children Succeed: Grit, Curiosity, and the Hidden Power of Character

Linear Algebra Resources

1) https://www.math.okstate.edu/~binegar/3013-S99/3013-l16.pdf

(How to diagonalize matrices)

2) http://www.sosmath.com/matrix/expo/expo.html

(How to find exponential of matrices)

3)  http://en.wikipedia.org/wiki/Matrix_differential_equation

(Matrix Differential Equations)

4) http://www.ucl.ac.uk/CNDA/courses/coursework/JNF.pdf

(Jordan Normal Form)

5) http://www.math.niu.edu/~fletcher/jnf.pdf

(Jordan Normal Form for 2×2 Matrices)

6) http://www.math.colostate.edu/~gerhard/M345/CHP/ch9_6.pdf

(Matrix Exponential with repeated Eigenvalues)

7) http://www.math.vt.edu/people/afkhamis/class_home/notes/F08W12.pdf

Click to access matrixexp.pdf

(Matrix Differential equation with repeated Eigenvalues)

8) http://www.math.utah.edu/~gustafso/2250matrixexponential.pdf

(Matrix Exponential of Block Diagonal)

Featured book:

Linear Algebra and Its Applications, 4th Edition
Linear algebra is relatively easy for students during the early stages of the course, when the material is presented in a familiar, concrete setting. But when abstract concepts are introduced, students often hit a brick wall. Instructors seem to agree that certain concepts (such as linear independence, spanning, subspace, vector space, and linear transformations), are not easily understood, and require time to assimilate. Since they are fundamental to the study of linear algebra, students’ understanding of these concepts is vital to their mastery of the subject. David Lay introduces these concepts early in a familiar, concrete Rn setting, develops them gradually, and returns to them again and again throughout the text so that when discussed in the abstract, these concepts are more accessible.

Rational Parametrization of a Circle & Pythagorean Triples

Today, we discuss an interesting topic rarely taught in school: The rational parametrization of a unit circle. That is, how to find the x coordinates and y coordinates of a circle expressed as a rational function? The usual parametrization of a circle is (cos t, sin t).

unit circle

We consider the straight line (l), passing through the point A(1,0) and the point (0,h).

The gradient of this line is \displaystyle m=\frac{h-0}{0-1}=-h.

The y-intercept of this line is h.

Hence the equation of line l is \boxed{y=-hx+h}.

We know the equation of the unit circle is \boxed{x^2+y^2=1}.

By solving the two simultaneous equations (boxed), we get a quadratic formula:

x^2(1+h^2)-2h^2x+h^2-1=0

Solving the above using the quadratic formula gives us \displaystyle x=\frac{h^2-1}{1+h^2}.

Using \boxed{y=-hx+h}, we get \displaystyle y=\frac{2h}{1+h^2}.

Hence, \displaystyle \boxed{ (\frac{h^2-1}{1+h^2},\frac{2h}{1+h^2})} is a parametrization of the unit circle.

We can use this to generate Pythagorean triples! Simply choose a value of h, say, h=8.

Then \displaystyle x=\frac{h^2-1}{1+h^2}=\frac{63}{65}.

\displaystyle y=\frac{2h}{1+h^2}=\frac{16}{65}.

Substituting into \boxed{x^2+y^2=1}, and multiplying by the denominator, we get the Pythagorean Triple 16^2+63^2=65^2 . Interesting?

Featured book:

Divine Proportions: Rational Trigonometry to Universal Geometry

This revolutionary book establishes new foundations for trigonometry and Euclidean geometry. It shows how to replace transcendental trig functions with high school arithmetic and algebra to dramatically simplify the subject, increase accuracy in practical problems, and allow metrical geometry to be systematically developed over a general field. This new theory brings together geometry, algebra and number theory and sets out new directions for algebraic geometry, combinatorics, special functions and computer graphics. The treatment is careful and precise, with over one hundred theorems and 170 diagrams, and is meant for a mathematically mature audience. Gifted high school students will find most of the material accessible, although a few chapters require calculus. Applications include surveying and engineering problems, Platonic solids, spherical and cylindrical coordinate systems, and selected physics problems, such as projectile motion and Snell’s law. Examples over finite fields are also included.

New Pedagogy: Math Without Word

tomcircle's avatarMath Online Tom Circle

When teaching Quadratic equation in Algebra class using the conventional math pedagogy, this is what you get …

image

Teaching Math without word, especially for autistic and dyslexic kids, using pictures, video games… look how easy is to explain difficult concepts – even for adults – why (-2)x (-3) = + 6 ?

image

http://www.transum.org/software/SW/YouTube/Video.asp?Movie=7odhYT8yzUM

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Euler on Math Education

Today all school maths subjects are taught separately as: Arithmetic, Geometry, Trigonometry and Algebra, influenced by Euler in 1727.
Since 18th century Maths has evolved rapidly with the biggest revolution of Modern (Abstract) Maths in 19th century from the French prodigy Galois in Group Theory.

The 20th and 21st centuries Maths continues to expand from Galois Abstract Maths to a chaotic state where no single mathematician can claim to know all aspects of Maths like Newton, Euler, Gauss…did.
It is time to re-look at Euler’s outdated Maths pedagogy of 4 distinct disciplines… Can these 4 subjects be taught as ONE combined ‘Math’ (americans spell as singular) subject ?

tomcircle's avatarMath Online Tom Circle

Euler was invited by Peter I of Russia in 1727 to work in the
Petersburg Academy of Sciences. He introduced the fundamental math
disciplines in school math education:
1. Arithmetic
2. Geometry
3. Trigonometry
4. Algebra
these 4 are taught as separate and specific subjects, versus 19 duplicated disciplines in Europe.

Euler influenced not only in Russia schools, but in schools worldwide today.

Source: Russian Mathematics Education
Vol 1: History and world significance
Vol 2: Programs and practices
(Publisher: World Scientific)

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Rational Trigonometry

tomcircle's avatarMath Online Tom Circle

UHG39: Rational trigonometry: an overview:

(Rational number only)

This is a revolutionary approach (2005) to teach Secondary / High school Trigonometry by using purely algebra, no geometry and no picture, no sine, cosine, tangent, etc.

New concepts:
Vector as an order pair (x, y)
Quadrance = magnitude of vector
Perpendicular of 2 vectors
Parallel
Spread (angle between 2 vectors)

Amazon Book by the Dr. NJ Wildburger:

image

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Fix a Wobbly Table (with Math)

Fix your wobbly table with just a small tweak – but why does this work?
Reddit discussion: http://www.reddit.com/r/BradyHaran/co…
Featuring Matthias Kreck from the University of Bonn.

Featured book:

The Princeton Companion to Mathematics

This is a one-of-a-kind reference for anyone with a serious interest in mathematics. Edited by Timothy Gowers, a recipient of the Fields Medal, it presents nearly two hundred entries, written especially for this book by some of the world’s leading mathematicians, that introduce basic mathematical tools and vocabulary; trace the development of modern mathematics; explain essential terms and concepts; examine core ideas in major areas of mathematics; describe the achievements of scores of famous mathematicians; explore the impact of mathematics on other disciplines such as biology, finance, and music–and much, much more.

Unparalleled in its depth of coverage, The Princeton Companion to Mathematics surveys the most active and exciting branches of pure mathematics, providing the context and broad perspective that are vital at a time of increasing specialization in the field. Packed with information and presented in an accessible style, this is an indispensable resource for undergraduate and graduate students in mathematics as well as for researchers and scholars seeking to understand areas outside their specialties.

 

 

ICM2014 — opening ceremony

First Female Mathematician to get Fields’ Medal: Maryam Mirzakhani!

http://www.youtube.com/watch?v=pOtj7VxbFMk

Featured book:

Modern Mathematics in the Light of the Fields Medals

This small book demonstrates the evolution of certain areas of modern mathematics by examining the work of past winners of the Fields Medal, the “Nobel Prize” of mathematics. Foreword by Freeman Dyson.

gowers's avatarGowers's Weblog

I’d forgotten just how full the first day of an ICM is. First, you need to turn up early for the opening ceremony, so you end up sitting around for an hour and half or so before it even starts. Then there’s the ceremony itself, which lasts a couple of hours. Then in the afternoon you have talks about the four Fields Medallists and the Nevanlinna Prize winner, with virtually no breaks. Then after a massive ten minutes, the Nevanlinna Prize winner talks about his (in this case) own work, about which you have just heard, but in a bit more detail. That took us to 5:45pm. And just to round things off, Jim Simons is giving a public lecture at 8pm, which I suppose I could skip but I think I’m not going to. (The result is that most of this post will be written after it, but right…

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Private Candidate Tuition & Ad hoc O Level Maths Tuition

Private Candidate Tuition

Taking your Math exam as a Private Candidate?

Currently we are available to tutor private candidates on weekday mornings.

Contact our friendly tutor Mr Wu: email at mathtuition88@gmail.com

Ad hoc O Level Maths Tuition

Nowadays students are often so busy that regular weekly tuition may not be an option. (Due to stay back in school, extra lessons etc.)

We offer Ad hoc O Level Maths Tuition at our tuition centre at Bishan. Students can come for tuition when they need to ask questions or clarify concepts.

Fees will be charged per lesson; this will fit the students’ busy schedule perfectly.

Visit this page to learn more: https://mathtuition88.com/maths-tuition-centre/

AlgTop1: One-dimensional objects

This is a continuation of the series of Algebraic Topology videos. Previous post was AlgTop 0.

Professor Wildberger is an interesting speaker. He holds some unorthodox views, for instance he doesn’t believe in “real numbers” or “infinite sets”. Nevertheless, his videos are excellent and educational. Highly recommended to watch!

The basic topological objects, the line and the circle are viewed in a new light. This is the full first lecture of this beginner’s course in Algebraic Topology, given by N J Wildberger at UNSW. Here we begin to introduce basic one dimensional objects, namely the line and the circle. However each can appear in rather a remarkable variety of different ways.

Featured book:

Divine Proportions: Rational Trigonometry to Universal Geometry

Author: NJ Wildberger

This revolutionary book establishes new foundations for trigonometry and Euclidean geometry. It shows how to replace transcendental trig functions with high school arithmetic and algebra to dramatically simplify the subject, increase accuracy in practical problems, and allow metrical geometry to be systematically developed over a general field. This new theory brings together geometry, algebra and number theory and sets out new directions for algebraic geometry, combinatorics, special functions and computer graphics. The treatment is careful and precise, with over one hundred theorems and 170 diagrams, and is meant for a mathematically mature audience. Gifted high school students will find most of the material accessible, although a few chapters require calculus. Applications include surveying and engineering problems, Platonic solids, spherical and cylindrical coordinate systems, and selected physics problems, such as projectile motion and Snell’s law. Examples over finite fields are also included.

Algebraic Topology Video by Professor N J Wildberger

This is the Introductory lecture to a beginner’s course in Algebraic Topology given by N J Wildberger of the School of Mathematics and Statistics at UNSW in 2010.

This first lecture introduces some of the topics of the course and three problems.

If you are curious about how to make the interesting flap of paper (Problem 1), the solution can be found here. 🙂

Featured book:

Divine Proportions: Rational Trigonometry to Universal Geometry

Author: N J Wildberger

This revolutionary book establishes new foundations for trigonometry and Euclidean geometry. It shows how to replace transcendental trig functions with high school arithmetic and algebra to dramatically simplify the subject, increase accuracy in practical problems, and allow metrical geometry to be systematically developed over a general field. This new theory brings together geometry, algebra and number theory and sets out new directions for algebraic geometry, combinatorics, special functions and computer graphics. The treatment is careful and precise, with over one hundred theorems and 170 diagrams, and is meant for a mathematically mature audience. Gifted high school students will find most of the material accessible, although a few chapters require calculus. Applications include surveying and engineering problems, Platonic solids, spherical and cylindrical coordinate systems, and selected physics problems, such as projectile motion and Snell’s law. Examples over finite fields are also included.

Math Trivia: Sum of all the Roulette Numbers is 666 !

roulette4

The numbers on a roulette are from 1 to 36, including one zero (European style) or two zeroes (American style).

What is the sum of all the numbers on the roulette wheel? The answer is actually 666, the “number of the beast”!

\boxed{1+2+3+\cdots +35+36=(37)(36)/2=666}

Interesting? Perhaps this is a warning that gambling is not good?!

Check out this interesting Math video too:

Featured book:

Secrets of Mental Math: The Mathemagician’s Guide to Lightning Calculation and Amazing Math Tricks
These simple math secrets and tricks will forever change how you look at the world of numbers.

Secrets of Mental Math will have you thinking like a math genius in no time. Get ready to amaze your friends—and yourself—with incredible calculations you never thought you could master, as renowned “mathemagician” Arthur Benjamin shares his techniques for lightning-quick calculations and amazing number tricks. This book will teach you to do math in your head faster than you ever thought possible, dramatically improve your memory for numbers, and—maybe for the first time—make mathematics fun.

Yes, even you can learn to do seemingly complex equations in your head; all you need to learn are a few tricks. You’ll be able to quickly multiply and divide triple digits, compute with fractions, and determine squares, cubes, and roots without blinking an eye. No matter what your age or current math ability, Secrets of Mental Math will allow you to perform fantastic feats of the mind effortlessly. This is the math they never taught you in school.

Reviews:

“The clearest, simplest, most entertaining, and best book yet on the art of calculating in your head.” —Martin Gardner, author of Mathematical Magic Show and Mathematical Carnival

Filipino street kid math genius

Check out this video of a Filipino street kid, who can calculate square roots without a calculator, and even knows the concepts of perfect squares and imaginary numbers!

 

Compare and contrast with this video:

No matter whether you are good or not so good at Math, it is never too late to learn! It is always possible to improve in Math.

Featured book:

Math Doesn’t Suck: How to Survive Middle School Math Without Losing Your Mind or Breaking a Nail

World’s Biggest Number that is actually used in a proof (Graham’s Number)

Check out this video on Graham’s Number — The World’s Biggest Number actually used in a mathematical proof! (Featuring Ron Graham himself!)

Featured book:

Magical Mathematics: The Mathematical Ideas That Animate Great Magic Tricks

Magical Mathematics reveals the secrets of amazing, fun-to-perform card tricks–and the profound mathematical ideas behind them–that will astound even the most accomplished magician. Persi Diaconis and Ron Graham provide easy, step-by-step instructions for each trick, explaining how to set up the effect and offering tips on what to say and do while performing it. Each card trick introduces a new mathematical idea, and varying the tricks in turn takes readers to the very threshold of today’s mathematical knowledge. For example, the Gilbreath Principle–a fantastic effect where the cards remain in control despite being shuffled–is found to share an intimate connection with the Mandelbrot set. Other card tricks link to the mathematical secrets of combinatorics, graph theory, number theory, topology, the Riemann hypothesis, and even Fermat’s last theorem.

Diaconis and Graham are mathematicians as well as skilled performers with decades of professional experience between them. In this book they share a wealth of conjuring lore, including some closely guarded secrets of legendary magicians. Magical Mathematics covers the mathematics of juggling and shows how the I Ching connects to the history of probability and magic tricks both old and new. It tells the stories–and reveals the best tricks–of the eccentric and brilliant inventors of mathematical magic.Magical Mathematics exposes old gambling secrets through the mathematics of shuffling cards, explains the classic street-gambling scam of three-card monte, traces the history of mathematical magic back to the thirteenth century and the oldest mathematical trick–and much more.

The Best Universities in 35 Countries

tomcircle's avatarMath Online Tom Circle

http://www.businessinsider.sg/the-best-universities-in-every-country-2014-7/#.U9pB58kZ7qA

image

Australia: University of Sydney
Canada: University of Toronto
China: 北京大学
Japan: Tokyo University
Hong Kong: 香港大学
France:  Ecole Normale Supérieure,  Paris
India: Indian Institute of Technology, Delhi
Taiwan: 国立台湾大学
UK: Cambridge University
USA: Harvard University

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Sum and Difference of Two Cubes

Students taking A Maths (Additional Maths) in 2014 should watch this: It may come out in the exam!

This is the newest addition to the new syllabus.

Featured book:

Practical Algebra: A Self-Teaching Guide, Second Edition

 

 

Come join INSINC! Stand to win $$ for off-peak trips on MRT and LRT. More than $2,500,000 paid out so far!!

This is for Singaporean readers of my blog. Thanks for your reading and support. 🙂

Here is a good recommendation for those who take the train regularly, with chances to win cash prizes.

Take the train (MRT or LRT) regularly? You can win $$ for off-peak trips on MRT and LRT! More than $2,500,000 paid out so far!!

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insinc

 

The Mandelbrot Set

Check out this video on the very interesting Mandelbrot Set:

Famously beautiful, the Mandelbrot Set is all about complex numbers. Featuring Dr Holly Krieger from MIT.

Featured book:

The Fractal Geometry of Nature

Clouds are not spheres, mountains are not cones, and lightening does not travel in a straight line. The complexity of nature’s shapes differs in kind, not merely degree, from that of the shapes of ordinary geometry, the geometry of fractal shapes.

Now that the field has expanded greatly with many active researchers, Mandelbrot presents the definitive overview of the origins of his ideas and their new applications. The Fractal Geometry of Nature is based on his highly acclaimed earlier work, but has much broader and deeper coverage and more extensive illustrations.

 

The advancement and perfection of mathematics are intimately connected with the prosperity of the state — Napoleon Bonaparte

Source: http://www.thehindu.com/features/education/careers/stay-ahead-with-math/article6252546.ece

From search engines to big data and cloud services, math plays a key role in IT applications. Read on to know more about the opportunities math has to offer.

In this increasingly digital world, mathematics is everywhere. It is wise to keep track of the myriad opportunities that would be laid open by mathematics education.

“The advancement and perfection of mathematics are intimately connected with the prosperity of the state,” said Napolean Bonaparte. While there may be several opinions regarding Napolean as a leader, this statement holds indisputably true even today.

Read more at: http://www.thehindu.com/features/education/careers/stay-ahead-with-math/article6252546.ece

Featured book:

The Princeton Companion to Mathematics

[News] NUS makes it easier for students in three faculties to qualify for honours

More than 80 or 90 per cent of students on four-year direct honours programmes at publicly-funded universities here graduate with honours or the equivalent. But only 60 per cent of those in the three-year arts and social sciences, business and science degree courses at the National University of Singapore (NUS) qualify for the fourth year of study, which allows them to graduate with honours.

To close the gap, NUS is lowering the grade to qualify for the honours year in these three schools, which are among the larger faculties in the university and take in some 3,600 students a year. This means another 10 to 15 per cent – 400 to 500 students- from these three faculties can move on to the fourth year to study for their honours.

Previously, students in the three faculties require a Cumulative Average Point (CAP) of 3.5 and above to qualify for honours study. With the change, they need only 3.2. NUS, though, will stick to its policy of keeping the the three plus one structure. Students who fail to notch up a score of at least 3.2 will have to exit the course.

NUS Provost Tan Eng Chye said the university decided to lower the requirement as the quality of students has gone up over the years. Students need As and Bs to enter most of the courses now. Last year, for example, students needed a ABB to enter the arts and social sciences course and those entering business needed triple As.

Source: NUS makes it easier for students in three faculties to qualify for honours

Featured book:

Math Doesn’t Suck: How to Survive Middle School Math Without Losing Your Mind or Breaking a Nail