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edited Mar 8, 2012 at 20:03

Liviu Nicolaescu

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If $P$ is a degree $ l $ differential operator then

$ |Pu||_s < C || u ||_{s+l}$ , $\forall u, s. $

Now take $s=-k$, $P=\nabla^l$. (Sorry. There seems to ne a problem with MathJaxs

answered Mar 8, 2012 at 19:01

Liviu Nicolaescu

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