- What is the difference between a theorem, a lemma, and a corollary? https://divisbyzero.com/2008/09/22/what-is-the-difference-between-a-theorem-a-lemma-and-a-corollary/ 2 comments
- Collatz conjecture - Wikipedia https://en.wikipedia.org/wiki/Collatz_conjecture 70 comments
- Gabriel's horn - Wikipedia https://en.wikipedia.org/wiki/Gabriel%27s_Horn 66 comments
- Banach–Tarski paradox - Wikipedia http://en.wikipedia.org/wiki/Banach–Tarski_paradox 20 comments
- Euler's identity - Wikipedia http://en.wikipedia.org/wiki/euler%27s_identity 4 comments
- Peano axioms - Wikipedia https://en.wikipedia.org/wiki/Peano_axioms 0 comments
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