Suppose I am considering set-valued maps $G_i:\Bbb R\to 2^\Bbb R$ which I know are both upper and lower continuous. Does it mean that the product map $G_1\times\dots\times G_n$ is upper and lower continuous?
2026-02-23 02:29:17.1771813757
Lower and upper semicontinuity of the Cartesian product
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