Crazy/weird/odd math proofs, concepts, theories, etc.

[BigPoppa]

Stuff like the fibonacci sequence and phi et al fascinate me for some reason. Anyone know any more interesting stuff? Tried googling, but googling odd math doesn't get me anywhere. Weird math came up with some different stuff, though.

 

[Savarak]

not really weird or odd, but one method I just recently learned for getting a better Ax=B solution for the x vector is to re-use the residual vector as another solution Ac=x(k) where k is the # of iterations and x(0) is the original x vector, and using x(0)+x(k)+x(k+1)+... etc until you reach the number of precision you need.... (or if it's an illconditioned problem, until your set maxiumum k is reached)...