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Oct 25, 2023 at 17:37 comment added Ilovemath @LSpice true, but is there any partial result, or will it always have to be analyzed case by case?
Oct 25, 2023 at 17:05 comment added LSpice I think $f(x, y) = \lvert x - y\rvert$ is a counterexample, if I've understood correctly.
Oct 25, 2023 at 16:45 history asked Ilovemath CC BY-SA 4.0