I'll second that Fourier transform. The idea that you could represent basically ...

		maximilian on March 11, 2008 \| parent \| context \| favorite \| on: Ask YC: What have you learned that rocked your wor... I'll second that Fourier transform. The idea that you could represent basically a list of numbers with a sum of sines, or any other orthonormal set is mindblowing to me. Nothing in math has blown my mind as much as functional analysis.