Question

What do you say two functions are orthonormal? Explain it.

Answer 1

Answer:

We define two "vectors" to be orthogonal if their inner product is equal to 0. ... To say functions f and g are orthogonal means to say the above integral is 0. Fourier series are just a series to express functions in L2[−π,π] as an infinite sum of orthogonal functions.

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