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<shachaf> learn The password of the month is still up for grabs.
author HackEso <hackeso@esolangs.org>
date Fri, 03 Jul 2020 10:20:25 +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.