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Given linearly independent $\{f_n\}_{n=1}^N$ how can we form $n$ linearly independent functions $\{F_n\}_{n=1}^N$ such that each $F_n$ is either an even or odd function? Thanks.

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Hint: First define the related functions $g_n(x)=f_n(x) + f_n(-x)$ and $h_n(x) = f_n(x) - f_n(-x)$, so that each $g_n$ is even and each $h_n$ is odd. Then linear combinations of $g_n$ are always even, and linear combinations of $h_n$ are always odd.

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How would we know that the functions so produced are linearly independent? –  f_n Oct 16 '11 at 20:40

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