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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 561c5f0d6b8b
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The bicyclic monoid is the free monoid generated by two wheels of a bicycle, quotiented by the restriction that the bicycle itself is equal to the identity.