A blog about math, puzzles, teaching, and academic technology

Euler's Gem: The polyhedron formula and the birth of topology

Princeton University Press

2008

Euler's Gem Facebook page

Buy it:

Princeton University Press

Amazon

Princeton University Press

2008

Euler's Gem Facebook page

Buy it:

Princeton University Press

Amazon

- Q. How many mathematicians does it take to change a lightbulb? A. 0.999... 5 hours ago
- Free @MathHorizons article this month asks, is 0.999...=1 even in the hyperreals (i.e., with infinitesimals)? (pdf) maa.org/sites/default/… 7 hours ago
- The table of contents is online: maa.org/press/periodic…. MAA members can read the online issue for free. twitter.com/divbyzero/stat… 7 hours ago
- The November issue of @MathHorizons has arrived! Articles by @darrenglass, @MrHonner, @CardColm. Halloween colors o… twitter.com/i/web/status/7… 7 hours ago
- My students will tell you that I hate the topological term "clopen." Now another reason to dislike it: nytimes.com/2015/09/24/bus… 9 hours ago

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- Music is math: ten songs about mathematics
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- E-Z Pass, speeding tickets, and the mean value theorem
- Showing two expressions are equal: stop the madness
- LaTeX now available in Google Docs
- Volumes of n-dimensional balls
- The geometry of meandering rivers
- Extreme examples and counterexamples

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