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ganymede

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Метрические пространства [Jul. 8th, 2008|09:12 pm]
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Слушал сегодня доклад Марии Мануэль. Оказывается, метрическое пространство X — это псевдофунктор из категории (X,X × X) в 2-категорию (*, [0,+∞), ≥).
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