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Splines minimizing rotation-invariant semi-norms in Sobolev spaces. (English) Zbl 0342.41012

Constr. Theory Funct. several Variables, Proc. Conf. Oberwolfach 1976, Lect. Notes Math. 571, 85-100 (1977).

MSC:

41A15 Spline approximation
46E35 Sobolev spaces and other spaces of “smooth” functions, embedding theorems, trace theorems
41A65 Abstract approximation theory (approximation in normed linear spaces and other abstract spaces)