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For over two millennia, mathematicians agreed on one thing: you can’t use trigonometry to prove Pythagoras’ Theorem—because ...

Preparing for mathematical olympiad or mathematical competitions? Check out these books, from beginner to advanced level, covering a variety of topics from number theory to geometry. Free sample ...

This is a companion to the book Introduction to Graph Theory (World Scientific, 2006). The student who has worked on the problems will find the solutions presented useful as a check and also as a m ...