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by FabHK 3578 days ago
Wonderful book, btw, for maths as a hobby is "Proofs from THE BOOK" [1].

One of Erdős's quirky notions was THE BOOK, in which God collected the most elegant and wonderful mathematical proofs. He said "You don't have to believe in God, but you should believe in THE BOOK."

The book above collects some wonderful proofs that could have made it into THE BOOK.

[1] https://en.wikipedia.org/wiki/Proofs_from_THE_BOOK