是他笨
发表于 2025-4-1 02:21:37
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缓和
发表于 2025-4-1 07:23:12
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decode
发表于 2025-4-1 13:30:51
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PANG
发表于 2025-4-1 16:03:05
Selection Theorems for Nonconvex-Valued Maps§6) shows that for an infinite-dimensional domain (namely, for the Hilbert cube .) it is possible to find a lower semicontinuous map . with {.(.)}, . ∈., an ELC.-family, for all . ∈ ., and with contractible values .(.) such that there is no continuous selection for ..