view wisdom/lambek's lemma @ 11201:33eb686843a8

<shachaf> swrjan s/pheasant back/dryad saddle/
author HackBot
date Thu, 28 Sep 2017 01:30:08 +0000
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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.