view wisdom/lambek's lemma @ 11189:2d8d118ae4ed

<oerjan> slwd oerjan//s,isiv,ipherabl,
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date Sun, 03 Sep 2017 03:56:32 +0000
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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.