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seen Oct 28 '13 at 13:05

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comment what are Smooth and Non Smooth Problem in optimization?
so my understanding of what is not differentiable was wrong. I can see unit sphere in $l1$ norm has corners, hence it is not differentiable in the axes. So how to find if a function is differentiable or not easily?
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asked what are Smooth and Non Smooth Problem in optimization?
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