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<oerjan> learn This is something shachaf likes to talk about. We\'re often unsure what this is, though.
author HackBot
date Sat, 09 Dec 2017 11:43:01 +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.