view wisdom/lambek's lemma @ 11232:65c5e843c3a3

<oerjan> revert
author HackBot
date Thu, 02 Nov 2017 15:31:53 +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.