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Dear all,

I am looking for a good reference for elliptic regularity in $L^1$. To be more precise

Let $\Omega\subset\mathrm{R}^n$ be a bounded smooth domain, let $A$ be a properly elliptic differential operator in $\Omega$ and let $B$ be a first order differential operator on $\partial\Omega$ satisfying the complementing condition. For $f\in L^1(\Omega)$ consider the problem

$$Au=f, \mbox{ in }\Omega,\qquad Bu=0, \mbox{ on }\partial\Omega.$$

It seems to be well-known that there is at least a weak solution $u\in W^{1,1}(\Omega)$. Is it possible to give a reference for this? Is it possible to state more regularity for $u$?

I would be very grateful for any useful hints on this problem.


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Given $u\in W^{1,1}$, how do you define $B u|_{\partial \Omega}$? – Liviu Nicolaescu Sep 5 '12 at 8:11

I found a reference where elliptic equations in L1 are dealt with: Tanabe, "Functional analytical methods for partialdifferential equations" There it is also explained in what way the boundary values are to be understood.

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Can you be more specific with this reference (journal, year of publication). I cannot seem to find the reference on MathSciNet – Liviu Nicolaescu Sep 6 '12 at 8:20… – Michael Renardy Sep 6 '12 at 9:29

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