## Posts Tagged ‘permutation group’

### A picture of frustration: Sam Loyd’s 15 puzzle

Posted by: **Dave Richeson** on March 1, 2011

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

Posted by: **Dave Richeson** on March 1, 2011

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

- A polyhedral torus made from 24 congruent isosceles triangles: V=12, F=24, E=36. (Source: plus.google.com/+IsaacCalder/p…) https://t.co/2CjIyfi2Kg 3 hours ago
- RT @LoganDobson: Don't believe in random sampling? Then next time you get a blood test, make sure the doctor takes all of it 18 hours ago
- Some things I've made: divisbyzero.com/2014/03/25/gab… divisbyzero.com/2016/04/21/mea… divisbyzero.com/2016/04/11/zip… youtube.com/watch?v=p5VTqU… #loveyourmath 22 hours ago
- Today's #loveyourmath: favorite math art. Some: Leonardo Da Vinci's polyhedra, Albrecht Dürer's Melencolia I, and R… twitter.com/i/web/status/7… 22 hours ago
- Interesting interview of my @DickinsonCol colleague Amy Farrell on Donald Trump's weight comments | The Atlantic theatln.tc/2dkNJF9 22 hours ago

- Lincoln and squaring the circle
- How to curve an exam and assign grades
- What is the difference between a theorem, a lemma, and a corollary?
- Is or an inclusive or or an exclusive or?
- Music is math: ten songs about mathematics
- LaTeX now available in Google Docs
- Showing two expressions are equal: stop the madness
- Trigonometric functions and rational multiples of pi
- Measuring an angle with a ruler
- Volumes of n-dimensional balls