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Links 1 through 2 of 2 by Paul Raven tagged Moebius

"Since 1930, the Möbius strip has been a classic poser for experts in mechanics. The teaser is to resolve the strip algebraically – to explain its unusual shape in the form of an equation."

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"The mathematician soon discovers [...] that the subway system, with its countless add-ons over the years, has become so incredibly labyrinthine [that] a gigantic Moebius strip was unwittingly created which the missing train is now trapped on."

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