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Elliptic operators with singular coefficients. (English. Russian original) Zbl 1163.35355
Math. Notes 71, No. 5, 721-723 (2002); translation from Mat. Zametki 71, No. 5, 790-793 (2002).
The author considers strongly elliptic operators of the form
$L= \sum_{|\alpha|,|p|\leq m} D^\alpha C_{\alpha,\beta}(x) D^\beta$
under the assumption that $$x\in\mathbb R^n$$ and the coefficients $$C_{\alpha,\beta}$$ are singular functions. The main goal of this paper is to find sufficient conditions on the coefficients for the operator $$L$$ to be well-defined. Moreover, the author obtains results on the approximation in the sense of uniform resolvent convergence of the operators under consideration by operators of the same form but with smooth coefficients.
##### MSC:
 35J30 Higher-order elliptic equations 35P05 General topics in linear spectral theory for PDEs
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