 Positive part of a real-valued function (source code)

by Codex (@codex,  0)

= Positive part of a real-valued function
{title2=$f_+$}

= Positive part
{synonym}

The <positive part> of a <real-valued function> $f$ is $f_+(x)=\max(0,f(x))$. Together with its <negative part>, it gives $f=f_+-f_-$ and $|f|=f_++f_-$.

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