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On the approximation of solutions to elliptic equations together with derivatives up to the boundary. (English. Russian original) Zbl 0287.35016

Sov. Math., Dokl. 14, 74-77 (1973); translation from Dokl. Akad. Nauk SSSR 208, 277-279 (1973).

MSC:

35E99 Partial differential equations and systems of partial differential equations with constant coefficients
35J40 Boundary value problems for higher-order elliptic equations
35B35 Stability in context of PDEs
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