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<oerjan> learn A cupboar is a very small boar. They may be found in cupboards.
author HackEso <hackeso@esolangs.org>
date Mon, 16 Jul 2018 16:53:17 +0100
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.