view wisdom/lambek's lemma @ 11300:3d3ef2b0ffe7

<int-e> learn Recursed is a game of surprising depth.
author HackBot
date Tue, 02 Jan 2018 19:08:00 +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.