Found in 5 comments on Hacker News
taeric · 2016-09-28
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There are full books on these called "Proofs Without Words". On my wishlist. :) https://amazon.com/dp/0883857006
jgg · 2010-07-01
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If you like this sort of thing, definitely check out this book: http://www.amazon.com/Proofs-without-Words-Exercises-Classro...
screwperman · 2009-07-25
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If you like this, you'll love the book Proofs without Words: Exercises in Visual Thinking: http://www.amazon.com/Proofs-without-Words-Exercises-Classro...
Nate · 2007-10-10
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If you really like visual mathematics, then there is a book called "Proofs without words":
http://www.amazon.com/Proofs-without-Words-Exercises-Classro...
A few years ago I re-drew a bunch of these in latex with my PhD advisor and another colleague [3]. We planned to print them as posters and hang them for a Pi day event that unfortunately never happened because the pandemic broke out.
[1] https://www.amazon.com/Proofs-without-Words-Exercises-Classr...
[2] https://en.m.wikipedia.org/wiki/Proof_without_words
[3] https://www.antonellaperucca.net/didactics/proof-without-wor...