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<wib_jonas> slashlearn ponderthis//Ponder This are monthly open-ended programming puzzle challenges that some regulars enjoy: https://research.ibm.com/haifa/ponderthis/index.shtml
author HackEso <hackeso@esolangs.org>
date Mon, 27 Feb 2023 10:56:19 +0000
parents d3a12978331a
children
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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.