Whilst browsing the usyd mathematics database I encountered this interesting serious. Various well known facts are proven using diagrams and graphs. There were literally hundreds, here are a few of them:
http://photobucket.com/albums/a105/proofwithoutwords/
Note: some of the pages contain sections of the text that are unrelated.
http://photobucket.com/albums/a105/proofwithoutwords/
Note: some of the pages contain sections of the text that are unrelated.