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

- RT @beesandbombs: ðŸš€ https://t.co/MGurKfGjzb 8 hours ago
- I really don't want to blow it: I've got to think up something clever and funny for my 10,000th tweet. Hmmm... https://t.co/3ep2v2hh4z 11 hours ago
- Aristotle on âˆš2 irrational: "diagonal is incommensurable because if it is put as commensurable, then odd numbers become equal to even ones." 11 hours ago
- Good metaphor that could apply in many situations... twitter.com/miclugo/statusâ€¦ 15 hours ago
- Q. How many mathematicians does it take to change a lightbulb? A. 0.999... 1 day ago

- How to curve an exam and assign grades
- What is the difference between a theorem, a lemma, and a corollary?
- Music is math: ten songs about mathematics
- Is or an inclusive or or an exclusive or?
- E-Z Pass, speeding tickets, and the mean value theorem
- Two More Impossible Cylinders
- Make a Sugihara Circle/Square Optical Illusion Out of Paper
- Volumes of n-dimensional balls
- Showing two expressions are equal: stop the madness
- LaTeX now available in Google Docs

## Leave a Reply