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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 ca4257b9b1e7
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A free structure is one that has no nontrivial identities, except algebraist phrase that in a much fancier way with morphisms.