A mollifier useful for approximations in Sobolev spaces and some applications to approximating solutions of differential equations. (English) Zbl 0257.65087


65N30 Finite element, Rayleigh-Ritz and Galerkin methods for boundary value problems involving PDEs
41A25 Rate of convergence, degree of approximation
41A15 Spline approximation
46E35 Sobolev spaces and other spaces of “smooth” functions, embedding theorems, trace theorems
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[1] Shmuel Agmon, Lectures on elliptic boundary value problems, Prepared for publication by B. Frank Jones, Jr. with the assistance of George W. Batten, Jr. Van Nostrand Mathematical Studies, No. 2, D. Van Nostrand Co., Inc., Princeton, N.J.-Toronto-London, 1965. · Zbl 0142.37401
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