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<oerjan> le/rn klein bottle//A Klein bottle is like a torus, but more insidious. Taneb tried to invent it, but got trapped inside.
author HackBot
date Thu, 09 Jun 2016 00:48:08 +0000
parents 7f957c1f4661
children c3d85315f276
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fun fact 0 = 1 | fact n = n * fact (n - 1)