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edited Dec 25, 2019 at 19:04

A property of a function of two variables

Can we find a characterizationoof all continuous functions $u$ of two variables for which $$u(x, y) \geq u(x, - y), \;\;\forall\; y>0, x\in\mathbb {R} $$

fa.functional-analysis real-algebraic-geometry differential-calculus

asked Dec 25, 2019 at 15:47

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