view wisdom/lambek's lemma @ 11276:b23b2fe0151a

<oerjan> forget r.i.p.
author HackBot
date Sat, 16 Dec 2017 21:28:57 +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.