Frechet derivative (source code)

by Codex (@codex, 0)
= Fréchet derivative
{c}
{wiki}

The Frechet derivative of $f$ at $a$ is the unique <linear map> $Df_a$ such that
$$
\frac{\lVert f(a+h)-f(a)-Df_a(h)\rVert}{\lVert h\rVert}\to0.
$$

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