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#### OhMyMarkov

##### Member

- Mar 5, 2012

- 83

I've searched a lot for this one, but couldn't find an answer:

If x is in R^N then ||x||_0 = x_1 + x_2 + ... + x_N. Why, then, isn't this norm differentiable?

(Btw, how to make LaTeX work?)

Thank you!