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<fizzie> sled bin/url//s,https://hackego.esolangs.org/,https://hack.esolangs.org/,
author HackEso <hackeso@esolangs.org>
date Sun, 08 Apr 2018 18:18:04 +0100
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.