I know that $|x|\in W^{1,1}(-1,1)$ and that $$|x|'=\begin{cases}1&x>0\\-1&x<0\end{cases}$$ what what is the derivative at $x=0$ ?
2026-03-28 08:27:52.1774686472
What is the weak derivative of $|x|$?
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