view wisdom/lambek's lemma @ 11226:c08627cbe6f0

<oerjan> revert
author HackBot
date Tue, 17 Oct 2017 02:15:13 +0000
parents d3a12978331a
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Lambek's Lemma, invented by Joachim "Taneb" Lambek, states that initial algebras have inverses. It can be proved with as few as five arrows.