view wisdom/lambek's lemma @ 11195:03cb49a25518

<shachaf> swrjan s/shifting/shifty/
author HackBot
date Thu, 21 Sep 2017 00:36:35 +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.