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On the dimension of spaces of piecewise polynomials in two variables. (English) Zbl 0461.41006
Multivariate approximation theory, Proc. Conf. math. Res. Inst. Oberwolfach 1979, ISNM Vol. 51, 396-412 (1979).

##### MSC:
 41A15 Spline approximation 41A63 Multidimensional problems (should also be assigned at least one other classification number from Section 41-XX)