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An example of a beautiful proof that would be accessible at the high school level?

1d ago Amir Asghari 185●3●11

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First known proof of $\sqrt 2$ is irrational with prime factorization?

sep 15 at 18:33 Carlo Beenakker 5,586●10●20

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Examples of theorems with proofs that have dramatically improved over time

jul 9 at 7:27 Per Alexandersson 1,761●6●12

 
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Is beauty at the high school level even possible? [closed]

sep 20 11 at 11:33 Thierry Zell 3,103●1●17●43