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when toggle format what by license comment
Jul 24, 2023 at 15:45 comment added Daniel Asimov Good point. (But a sphere isn't possible, so the graph of 𝜓 must be a hyperplane.)
Jul 24, 2023 at 15:01 vote accept Luis Yanka Annalisc
Jul 24, 2023 at 14:26 history answered Vladimir S Matveev CC BY-SA 4.0