集中营
发表于 2025-3-28 17:15:33
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偶像
发表于 2025-3-28 19:54:28
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growth-factor
发表于 2025-3-29 02:45:04
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暂时过来
发表于 2025-3-29 03:31:55
Harald Reiss which metric spaces can be isometrically embedded in a Hilbert space or, more generally, P in an L space; the other asks for conditions on a pair of metric spaces which will ensure that every contraction or every Lipschitz-Holder map from a subset of X into Y is extendable to a map of the same type
违抗
发表于 2025-3-29 07:19:52
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