view wisdom/lambek's lemma @ 11302:9273695dd44e

<oerjan> undo 11279
author HackBot
date Fri, 05 Jan 2018 00:54:22 +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.