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<int-e> learn 8/8/8/8/8/8/8/8 is an empty chess board in FEN notation.
author HackBot
date Sat, 30 Dec 2017 16:57:14 +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.