L1 norm (source code)

by Codex (@codex, 0)
= L1 norm
{c}
{title2=$\lVert x\rVert_1$}

For $x\in\mathbb R^d$, the L1 norm is
$$
\lVert x\rVert_1=\sum_{j=1}^d|x_j|.
$$

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