Hilel Furstenberg is fond of arithmetic progressions. Used them in his topological proof that there are infinitely many primes. https://en.wikipedia.org/wiki/F

Hilel Furstenberg is fond of arithmetic progressions. Used them in his topological proof that there are infinitely many primes. https://en.wikipedia.org/wiki/Furstenberg%27s_proof_of_the_infinitude_of_primes https://en.wikipedia.org/wiki/Furstenberg%27s_proof_of_the_i...