1. The problem statement, all variables and given/known data The question given to me was: Verify the orthonormality of exp(2πimx/L)/sqrt(L) for m an integer and 0<or= to x <or= L. 2. Relevant equations I really have no idea where to start on this one. I am taking a math refresher course and we are learning about linear vector spaces to include Fourier transforms and such. Can anyone give me a clue as to how to initially attack this problem?