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<oerjan> learn_append A test is a test, in jest, in jest.
author HackBot
date Tue, 12 Dec 2017 21:58:37 +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.