(on weeaboo sites and chatrooms) to lol. The "w" comes from "warau" (įŽã), Japaneseverb for "laugh". The actual number of w's used is immaterial but 5 is considered to be a common minimum.
Haruhi: Previews are worthless, listen to my song!
Kyon: BOMBERRRRR!!!
RandomWeeaboo: wwwwwwwwwww
Which Was What We Wanted. The abbreviation WWWWW may be placed at the end of a mathematical proof to serve a similar purpose as QED.
We will prove by reductio ad absurdum that there are infinitely many primes.
Assume the opposite, that there are exactly n primes. Let set S contain all n primes in increasing order, such that S={X1, X2, X3... Xn}.
Consider Y such that Y=1+(X1*X2*X3*...*Xn)
Y gives a remainder of 1 when divided by any element of S. Hence Y is not divisible by any prime and must be a prime itself. Yet this contradicts the assumption that there are only n primes, as the existence of Y means there must be at least n+1 primes.
The assumption must then be false and there must be infinitely many primes.