Talk:Danskin's theorem
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semi-differentiability.
[edit]I have modified the conclusion of the theorem of Danskin; it was wrong; the good conclusion is f is semi-differentiable. the case of f(x)=max(-x,x) provides an example of a function not directionaly differentiable. BRousselet (talk) 15:31, 4 August 2022 (UTC)