DropBox
This is my own "column" on various issues I'm interested in. Here I'm gonna collect some information or reasonings that I consider useful and worth storing somewhere.
I will write some interesting mathematical problems and puzzles now and there. To make things easier for me I'll write the solution to most of them at the end of the page. I strongly suggest you to stop and try to solve them by your own. Solving a tough problem is one of the most rewarding experiences in life.