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<ais523_> le//rn password//The password of the month is mostly irrelevant.
author HackEso <hackeso@esolangs.org>
date Mon, 04 Nov 2019 10:56:10 +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.