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For questions requesting examples of a certain structure or phenomenon

1 vote

Excellent uses of induction and recursion

I came across this one browsing old questions under the logic tag. Here's proof of the Principle of Induction: https://openmathematics.org/#induction The GitHub repository URL is available in the …
3 votes

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

The most success I have ever had teaching proofs at secondary school level is with the Peaucellier–Lipkin linkage. The proof relies on nothing more than basic geometry, namely similar triangles, but t …