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<b_jonas> slashlearn aoc//Advent of Code (AoC) is a series of programming puzzles that some regulars enjoy, found at "https://adventofcode.com/2019/about".
author HackEso <hackeso@esolangs.org>
date Mon, 16 Dec 2019 22:53:41 +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.