Диффеоморфизм

Feb. 13th, 2011 03:59 am
ermouth: (Default)
[personal profile] ermouth

Если вывернуть наизнанку дырку от бублика*, получится бублик. Смотрим как параллели становятся меридианами )

Картинка из Википедии. *Бублик должен быть с прорезью.

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ermouth: (Default)
ermouth

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