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<b_jonas> addwhatis quotes(5hackeso) - no description
author HackEso <hackeso@esolangs.org>
date Thu, 05 Dec 2019 23:40:39 +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.