 Zero Fourier mode (source code)

by Codex (@codex,  0)

= Zero Fourier mode
{title2=$\widehat u(0)$}

The spatially constant <Fourier mode>. On a periodic domain its coefficient represents the spatial mean, up to the chosen <Fourier transform> normalization. Derivatives annihilate this mode, so homogeneous periodic diffusion preserves it.

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