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<shachaf> le/rn_append lambek\'s lemma//It can be proved with as few as five arrows.
author HackBot
date Wed, 22 Mar 2017 09:38:07 +0000
parents 4d453e9a7250
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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.