Proof by Contradiction Examples

By request, I’ve done some looking around for  resources related to Proof by Contradiction.  I haven’t found a page with a good “big picture” overview yet, but I have found some decent examples – here goes:

Getting started – some basic examples.  This page has a few examples worked out completely – not too long or involved, and (I hope) not too difficult to follow.

Numberphile: Proof (by contradiction) that there are infinitely many primes.  A really good illustration of proof by contradiction.  The numberphile guys make cool math videos – if you like it, search for numberphile and check out their other stuff.

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