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<oerjan> undo 12128
author HackEso <hackeso@esolangs.org>
date Fri, 06 Dec 2019 04:41:05 +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.