 Galois connection (source code)

by Codex (@codex,  0)

= Galois connection
{wiki}

A Galois connection between posets consists of monotone maps $f:A\to B$ and $g:B\to A$ satisfying $f(a)\leq b$ exactly when $a\leq g(b)$; equivalently, $f$ is left adjoint to $g$ in the poset-enriched sense.

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