Whether you're a high school student or a professor with 9 #PhD's, this is useful.
(I'm late to the game, I know.)
http://amzn.to/2he6i0H pic.twitter.com/ZVlKA5gX5J
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If you like combinatorics check out (MUCH narrower): "The Method of Undetermined Generalization" Doron Zeilberger https://arxiv.org/abs/math/9506215 …
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