Author Archives: mathtuition88

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Chen Jingrun–Do You Really Know About the Giant (1)

Originally posted on Quantum Han's Forum:
This time, let’s talk about math; exactly speaking, a mathematician. My favorite things in this world are math and physics. Today, I cannot wait to share with you some stories of Chen Jingrun,…

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Chen Jingrun–Do You Really Know About the Giant? (2)

Originally posted on Quantum Han's Forum:
“Each work of Mr. Chen Jingrun seems as if it is scaling the tallest mountains of the Himalayas. It is perilous [work], but if successful, will certainly affect the world.” (André Weil, Wolf…

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Chen Jingrun Biography Video

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Time, Energy, Money at different phases of life

Hmm… Sad but true? Source: Pinterest

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Singapore Haze & Subgroup of Smallest Prime Index

Originally posted on Singapore Maths Tuition:
Recently, the Singapore Haze is getting quite bad, crossing the 200 PSI Mark on several occasions. Do consider purchasing a Air Purifier, or some N95 Masks, as the haze problem is probably staying for…

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Group of order 56 is not simple + Affordable Air Purifier

Originally posted on Singapore Maths Tuition:
Haze strikes Singapore again, this time it is quite serious as the PSI is often above 300. For those seeking an affordable air purifier, do consider this air purifier which is one of the few…

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Haze affects Wifi Speed?

Recently, Singapore is plagued by the haze, arising from forest fires in Indonesia. This is a common occurrence that happens yearly. Simultaneously, I noticed a drop in Wifi speed both at home and at work. Is this a coincidence? Or … Continue reading

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Advanced Excel Date Editing and Formatting

Suppose you have an Excel file with dates in the format DD/MM/YYYY. So you have entries like 02/03/1999 (2 March 1999). Suppose you want to change it to 2/3/1999, i.e. remove leading zeroes from one digit days and months. It … Continue reading

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How to Score Good Marks in Class 11 Mathematics?

Mathematics is a high scoring subject in class 11 among all the subjects.  Mathematics plays an essential role for all the students to get admission in the best engineering colleges. Even though the students have prepared the problem many times, … Continue reading

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Excellent video on Bishop/Vienna Opening

Bishop’s opening is an excellent opening for White, that is not very well known. It has some dangerous traps like the video below.

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My Neon Tetra 5 Gallon Planted Tank

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Calculate Cronbach Alpha using Python

R has the package “psych” which allows one to calculate the Cronbach’s alpha very easily just by one line: psych::alpha(your_data, column_list) For Python, the situation is more tricky since there does not seem to exist any package for calculating Cronbach’s … Continue reading

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Python code for PCA Rotation “varimax” matrix

The R programming language has an excellent package “psych” that Python has no real equivalent of. For example, R can do the following code using the principal() function: principal(r=dat, nfactors=num_pcs, rotate=”varimax”) to return the “rotation matrix” in principal component analysis … Continue reading

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Epsom Salt Treatment for Main Tank Dosage

The recommended dosage seems to be: 1/8 flat teaspoon (around 0.5 ml) per 5 US gallon within aquarium (long term) 1 flat tablespoon (around 15 ml) per gallon for 10 minute bath (short term) Epsom salts can be used to … Continue reading

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Hướng dẫn đầy đủ về VPN tại Trung Quốc

Cách truy cập Gmail, YouTube, Facebook, WhatsApp tại Trung Quốc Điều nổi tiếng là một số trang web thiết yếu bị chặn ở Trung Quốc: Toàn bộ bộ sản phẩm của Google. Điều này bao gồm Gmail, tìm kiếm Google, … Continue reading

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中国のVPNの完全ガイド

中国でGmail、YouTube、Facebook、WhatsAppにアクセスする方法 中国ではいくつかの重要なWebサイトがブロックされていることはよく知られています。 Googleの製品スイート全体。 これには、Gmail、Google検索、YouTube、Googleドライブ、Google Scholarなどが含まれます。 Facebookの製品スイート全体。 Facebookが所有しているため、これにはWhatsAppも含まれます。 Twitterなど、他のほとんどの「Western」ソーシャルメディア。 WordPress.com、Blogger.comなど、ほとんどのブログサイト。 これには、ログインページだけでなく、WordPress.com、Blogger.comなどによって作成されたすべてのサイトも含まれます。 Dropboxなどのほとんどのファイル共有サイト。 ウィキペディア トファイアウォールは、ビジネスマン、学生、または単なる観光客であるかどうかにかかわらず、ほとんどの人にとって不便な多くの重要なサービスをブロックしています。 ファイアウォールがより強力になり、多くのVPNが以前ほどうまく機能しないため、近年(2019年以降)悪化しています。 この包括的なガイドでは、中国のグレートファイアウォールをバイパスし、Google、YouTube、Facebookなどに接続するのに役立つさまざまなオプション(VPNなど)について説明します。 無料サービスと有料サービス、および非VPNソリューションが含まれます。 ***非常に重要:無料または有料のすべてのVPNは、中国に入る前にダウンロードして設定する必要があります。 中国に入国すると、VPNでアカウントをダウンロードまたは設定できない場合があります。 無料のVPN ほとんどのWebサイトでは、無料VPNについては何のメリット(手数料)も得られないため、無料VPNについては説明していません。 ここでは、信頼できる信頼できる無料のVPNのみをお勧めします。 データを盗んだり漏洩したりする可能性のある日陰の「無料の」VPNが存在することに注意してください。 以下の無料VPNでは、クレジットカードデータは必要ありません。 ***重要:無料のVPNのみに依存している場合は、2つまたは3つの選択肢をダウンロードして設定することをお勧めします。 これは、通常、無料のVPNは安定性が低く、サーバーの場所が少ないためにブロックされる傾向があるためです。 Windscribe Free VPNレビュー 実際の専門会社からの非常にまともな無料VPN。 毎月リセットされる約10 GBの無料のデータ帯域幅が得られ、友達にツイートしたり紹介したりすることでさらにデータを取得できる可能性があります。 私は個人的に中国のさまざまな都市でWindscribeの無料版を試してみましたが、それは(ほとんどの場合)動作します。 ただし、完全な接続を期待しないでください。 無料のWindscribeを使用する場合は、Windscribeの公式Webサイトでサインアップしてください。 TunnelBear無料レビュー TunnelBearは、クレジットカード情報を必要としない無料プラン(毎月500 MB)も提供しています。 私の経験では、Windscribe FreeはTunnelBear freeよりも優れています(接続の可能性とサーバーの場所の数に基づきます)。 … Continue reading

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중국 VPN에 대한 완벽한 가이드

중국의 Gmail, YouTube, Facebook, WhatsApp에 액세스하는 방법 중국에서는 몇 가지 필수 웹 사이트가 차단되어 있습니다. 전체 Google 제품군 여기에는 Gmail, Google 검색, YouTube, Google 드라이브, Google 학술 검색 등이 포함됩니다. 전체 Facebook 제품군. Facebook이 소유하고 있기 때문에 WhatsApp도 포함됩니다. 트위터와 … Continue reading

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Jack Ma Returns to Hupan: Birthplace of Alibaba

Hupan Garden, Jack Ma’s Hangzhou apartment in 1999, is where it all began for Alibaba. On the eve of the company’s 20th birthday, we took Ma back to Hupan to reflect on those early days and what it took to … Continue reading

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Guía completa de VPN en China

Cómo acceder a Gmail, YouTube, Facebook, WhatsApp en China Es bien sabido que varios sitios web esenciales están bloqueados en China: El conjunto completo de productos de Google. Esto incluye Gmail, búsqueda de Google, YouTube, Google Drive, Google Scholar, etc. … Continue reading

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中国VPN完整指南

如何在中国访问Gmail,YouTube,Facebook,WhatsApp 众所周知,中国有几个重要网站被封锁: 整套谷歌产品套件。 这包括Gmail,Google搜索,YouTube,Google云端硬盘 Google学术搜索等。 整个Facebook套件产品。 这也包括WhatsApp,因为它归Facebook所有。 大多数其他“西方”社交媒体,如Twitter。 大多数博客网站,包括WordPress.com,Blogger.com。 这不仅包括登录页面,还包括WordPress.com,Blogger.com等创建的所有网站。 大多数文件共享网站,例如Dropbox。 维基百科 正如您所看到的,中国的防火墙阻止了许多基本服务,这些服务会给大多数人带来不便,无论您是商人,学生还是休闲旅游者。 近年来(2019年以后)它已经恶化,因为防火墙变得越来越强大,许多VPN不能像以前那样运行良好。 在本综合指南中,我们将介绍各种选项(VPN等),它们将帮助您绕过中国的防火墙,并连接到谷歌,YouTube,Facebook等。 我们包括免费和付费服务,以及非VPN解决方案。 ***非常重要:在您进入中国之前,必须下载并设置所有免费或付费的VPN。 进入中国后,您可能无法在VPN上下载或设置帐户。 免费VPN 大多数网站都没有告诉你有关免费VPN的事情,因为他们没有从中获益(佣金)。 我们只会在此推荐值得信赖,可靠的免费VPN。 请注意,存在一些可能会窃取或泄露数据的阴影“免费”VPN。 以下免费VPN不需要任何信用卡数据。 ***重要提示:如果您只依赖Free VPN,建议下载并设置2或3个备选方案。 这是因为Free VPN通常不太稳定,并且由于服务器位置较少而更容易被阻止。 Windscribe免费VPN评论 一个非常体面的免费VPN,来自一个真正的专业公司。 您可以获得大约10 GB的免费数据带宽,每月可以重置,有可能通过推特或引用您的朋友获得更多。 我亲自在中国的不同城市尝试过Windscribe的免费版本,它的工作原理(大部分时间都是如此)。 不要指望完美连接。 如果您决定使用免费Windscribe,请在Windscribe官方网站上注册。 TunnelBear免费评论 TunnelBear还提供免费计划(每月500 MB),不需要您提供任何信用卡信息。根据我的经验,Windscribe Free比TunnelBear更好(基于连接的机会和服务器位置的数量)。然而,话虽如此,很可能会发生在任何给定时间,TunnelBear可以连接,而Windscribe不能。因此,建议同时获得Free Windscribe和TunnelBear。 灯笼(蓝灯)VPN免费评论 … Continue reading

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Complete Guide to VPN in China

How to Access Gmail, YouTube, Facebook, WhatsApp in China It is well-known that several essential websites are blocked in China: The entire Google suite of products. This includes Gmail, Google search, YouTube, Google Drive, Google Scholar, etc. The entire Facebook … Continue reading

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Excel: Find Sum, Average, Median by ignoring NA or invalid values

Today I just found out about the AGGREGATE function in Microsoft Excel, which allows you to find the sum, average, median, product and various other statistical numbers while ignoring NaN values. The usual Excel function of AVERAGE will produce errors … Continue reading

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Stormwind Music (WoW classic)

Recently, World of Warcraft (WoW) classic is immensely popular once again. I previously played WoW classic (and the expansions Burning Crusade and Wrath of the Lich King) up to level 80 for Gnome Mage. I can say that it is … Continue reading

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Singtel Fibre Broadband Recontract Voucher

It is well-known that the Singtel Recontract Voucher for phones/internet fibre broadband is quite elusive and hard to get nowadays. Long gone are the days where you can dial 1688 and speak to a human Singtel operator to give you … Continue reading

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Travel back in time to Singapore’s pre-colonial history beyond 1819

This is quite a nice exhibition to check out the history of Singapore before independence. Contrary to popular belief, Singapore was already far from a “fishing village” in 1819. Admission for Singapore citizens and PRs are free. CapitaStar members can … Continue reading

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Grab Voucher (heavily discounted price)

URL: Buy $10 Grab Voucher from Shopee for just $8.60 If you are a regular user of Grab, there is a very easy way for you to have up to 14% discount on your Grab rides. The way is by … Continue reading

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Mathtuition88 Facebook Page (Free Educational News)

Do check out our new revamped Facebook page at: https://www.facebook.com/mathtuition88/ We do upload exclusive content (at least once a week) on Education, Math, and general information.

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No More Recontract Voucher from Singtel? Best Phone to Recontract and Sell

Originally posted on Singapore Maths Tuition:
It is an “open secret” last time that if you call the Singtel customer service hotline at 1688, they may give you a recontract voucher for you to get a new phone. In previous…

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Singtel Voucher $100

Originally posted on Singapore Maths Tuition:
Singtel Voucher Link: Click here to enter Official Singtel Voucher Website As most people will know by now, Singtel is cutting down the recontract voucher. Nowadays it is hard to get Singtel recontract voucher, or…

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How to write Bash file to run multiple Python scripts simultaneously

Step 1 is to create a Bash file (using any editor, even Notepad). Sample code: #!/usr/bin/env bash python testing.py & python testingb.py & The above code will run two Python files “testing.py” and “testingb.py” simultaneously. Add more python scripts if … Continue reading

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How to run Python on Server

I was trying to learn how to run Python scripts on a (remote) server. Amazingly, none of the Google first page results were relevant to what I wanted to do. After much research (and searching around on the web), the … Continue reading

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Cheap Portable Aircon

Originally posted on Singapore Maths Tuition:
How to stay Cool in Singapore Singapore’s heat and humidity makes it quite unbearable to live without an air-conditioner. Especially for students who study, a hot and humid environment makes it harder to concentrate.…

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SUSS Graduation Rates (One in five part-timers do not make it to the second year)

Recently saw an article on SUSS dropout rates: https://www.suss.edu.sg/docs/default-source/default/20190815—big-data-helps-suss-assess-student-dropout-risk.pdf?sfvrsn=724aa912_0 About 20 per cent of SUSS’ parttime students do not make it to the second year. It currently has about 2,000 students who are at-risk, with a cumulative grade point average … Continue reading

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$54 Promotion by OCBC

There is a new ongoing promotion by OCBC bank: OCBC Passbook and Statement Savings Accounts Get S$54 cash credit with every S$5,000 in fresh funds deposited in an OCBC Passbook or Statement Savings Account, with no limit. Funds deposited must be … Continue reading

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Python Water Changer Singapore

I have checked all the aquarium shops at the famous aquariums at Clementi Blk 328 (also known as C328 LFS). They do not carry the Python Water Changer or similar products such as the Aqueon Aquarium Water Changer. Hence, the … Continue reading

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Avocado Egg (Deviled Eggs)

Originally posted on Cooking For Fun:
I used 4 eggs and 1 small ripe avocado in this recipe. You can adjust it according to your preference, use more eggs, less avocado or less eggs and more avocado. Boil eggs till…

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What Makes an Amazing Nursery? 3 Things You Should Look for When Choosing a Nursery

Sending your child to nursery can be a very stressful decision. In fact, it is probably one of the most important decisions you will have to make for your child after he is born. After all, the learning environment that … Continue reading

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Dunman High DSA

Dunman High DSA Tips Dunman High is a good school that has a very good school culture. It is strong in several CCAs (Co-curricular activities). Its Chinese Orchestra is exceptionally good (and large in terms of numbers), in fact most … Continue reading

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Free Software for Meta Analysis (OpenMeta Analyst)

Open Meta Analyst Review Open Meta-Analyst (http://www.cebm.brown.edu/openmeta/#) is a free software developed by professors in Brown University, for Meta Analysis. Previously we reviewed another free software RevMan5. RevMan5 is very good at doing meta analysis with placebo control groups. What … Continue reading

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How to do Forest Plots using Software

According to many online reviews, an easy way to do Forest Plots (Forrest Plots) is supposedly to use the free RevMan software. RevMan (currently RevMan5) can be downloaded here. RevMan is a software geared towards medical statistical analysis. RevMan is … Continue reading

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Spicy Sticky Rice Cake (Tteokbokki)

Originally posted on Cooking For Fun:
It’s a Korean style dish. I love almost all the food made from sticky rice. For the sticky rice cake, I bought from supermarket. It’s vacuum pack. Sticky rice cake is very hard and…

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Walnut Banana Bread

Originally posted on Cooking For Fun:
Banana is one of my husband’s favorite fruit. But sometimes, He forgot to eat them, and banana got ripe very quickly. So I would use them to make smoothie or cake or bread. This…

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Forest Plot Correct Spelling and what is “Forrest Plot”

The original spelling is “Forest plot”, the name refers to the forest of lines produced. In September 1990, Richard Peto joked that the plot was named after a breast cancer researcher called Pat Forrest and as a result the name … Continue reading

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Ribs & Seaweed Soup

Originally posted on Cooking For Fun:
My husband doesn’t like seaweed. But I think seaweed is really good for health. Yet, he doesn’t say no to seaweed soup. So I made this soup for him. Since I used dry seaweed,…

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Choosing which statistical test to use

The top video on YouTube on how to choose an appropriate statistical test.

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New PSLE System favors “All Rounders” over “Specialists”

Originally posted on Singapore Maths Tuition:
The new PSLE system clearly favors “all-rounders” over “specialists”. Scenario 1: Math-Whiz VS All-Rounder Imagine a Math/Science-whiz with Math:100 (AL 1) Science: 98 (AL 1) English: 84 (AL 3) Chinese: 84 (AL 3) Total…

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Mushroom Sauced Chicken Chop With Penne

Originally posted on Cooking For Fun:
Prepare a boneless chicken leg. Cut it slightly to prevent curling up while cooking. Season it with salt and black pepper. Heat a pan. Usually I don’t add in oil, cos chicken leg contains…

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Convert Excel to LaTeX

This tool https://www.tablesgenerator.com/ is a lifesaver if you are trying to convert Excel tables to LaTeX format. LaTeX tables are notoriously difficult and tedious to write manually. If you already have an Excel (or .csv) table, you can easily change … Continue reading

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SCGS Mathematics

SCGS (Singapore Chinese Girls’ School) follows the IP system, with students having the option to continue to Eunoia Junior College, the newest JC. SCGS IP Mathematics SCGS IP Mathematics is still split into E Maths (Elementary Mathematics) and A Maths … Continue reading

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Braised Pork & Rib Soup Bento

Originally posted on Cooking For Fun:
The rule of my husband’s bento: there must be at least 1 meat dish. This time, I tried pork. Prepare soup. Cos soup is time-consuming. I can let the soup on the stove while…

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