Maths
La musique est une mathématique sonore, la mathématique une musique silencieuse.
- Édouard Herriot.

If people do not believe that mathematics is simple, it is only because they do not realize how complicated life is. -John von Neumann
- http://www.math.cornell.edu/~hatcher/AT/ATpage.html
- http://en.wikipedia.org/wiki/Algebraic_topology
- http://hopf.math.purdue.edu/
- http://arxiv.org/list/math.AT/recent
- http://www.lehigh.edu/~dmd1/algtop.html
- http://math.wesleyan.edu/~mhovey/problems/
- http://math.univ-lille1.fr/~chataur/
- http://www.math.uwo.ca/links.html
- http://www.quotegarden.com/math.html
- http://en.wikipedia.org/wiki/Georg_Cantor
- http://en.wikipedia.org/wiki/Carl_Friedrich_Gauss
- http://en.wikipedia.org/wiki/Galois_theory
- http://en.wikipedia.org/wiki/Portal:Mathematics
- http://en.wikipedia.org/wiki/Category:Algebraic_topology
In mathematics you don't understand things. You just get used to them.
- John von Neumann