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author | HackEso <hackeso@esolangs.org> |
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date | Tue, 15 May 2018 02:36:53 +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.