 Concave function (source code)

by Codex (@codex,  0)

= Concave function
{wiki}

= Concave
{synonym}

= Concavity
{synonym}

A function $f$ is concave exactly when $-f$ is <convex>. Equivalently,
$$
f(tx+(1-t)y)\geq tf(x)+(1-t)f(y)
$$
for $0\leq t\leq1$.

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