|We have enough mathematicians here to ask this: What would you suggest as an equivalent of FizzBuzz for mathematicians?|
Some suggest proving sqrt(2) is irrational, but many technical types who aren't really mathematicians can do that because they've read enough popular math books. Similarly proving that there are infinitely many primes.
So, mathematicians, what would you suggest?
And for the non-mathematicians, what would you like to have explained, that you think every mathematician probably knows?
Added in edit: I thought this was a great discussion with some interesting suggestions, but I see it's been flagged off the front page.
So that's that, another interesting discussion killed. Oh well, never mind.