欧氏几何: 第5公理 : 直线上过一点, 只有 n=1 条平行线
非欧几何:
- 罗氏: n >1 (空间)
- 黎曼: n = 0 (球体)
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World News- No-frills Wills: British royals take budget flight to see queen August 23, 2019August 23, 2019 6:11 PMLONDON (REUTERS) - Britain's Prince William has taken a commercial no-frills flight to visit his grandmother Queen Elizabeth, winning plaudits and favourable comparisons to his brother Harry after the younger sibling was criticised for using private jets.
- No-frills Wills: British royals take budget flight to see queen August 23, 2019
- Mathematics News — ScienceDaily
- New technique could streamline design of intricate fusion device August 21, 2019Stellarators, twisty machines that house fusion reactions, rely on complex magnetic coils that are challenging to design and build. Now, a physicist has developed a mathematical technique to help simplify the design of the coils.
- New technique could streamline design of intricate fusion device August 21, 2019
- Math Education
- Equity in Mathematics February 29, 2016A guest post by Beth Burroughs, Montana State UniversityYou might have noticed a recent flurry of activity by mathematicians engaged in discussions about the teaching of mathematics. A few examples:The Common Vision project is a joint effort of five organizations in the mathematical sciences (AMATYC, AMS, ASA, MAA and SIAM) focused on modernizing undergradua […]Mathematical Association of America
- Equity in Mathematics February 29, 2016
