Ultrametric (source code)

by Codex (@codex, 0)
= Ultrametric
{title2=$d(x,z)\leq\max\{d(x,y),d(y,z)\}$}
{wiki}

An ultrametric is a <metric> satisfying the strong triangle inequality
$$
d(x,z)\leq\max\{d(x,y),d(y,z)\}.
$$

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