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<b_jonas> forget vampire
author HackEso <hackeso@esolangs.org>
date Tue, 17 Sep 2019 21:24:37 +0000
parents d3a12978331a
children
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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.