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Universally optimal approximation of functionals. (English) Zbl 0449.41003

41A10 Approximation by polynomials
41A55 Approximate quadratures
65D32 Numerical quadrature and cubature formulas
30E20 Integration, integrals of Cauchy type, integral representations of analytic functions in the complex plane
41A15 Spline approximation
41A25 Rate of convergence, degree of approximation
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[1] I. Babuška: Über universal optimale Quadraturformeln. Teil 1., Apl. mat. 13 (1968), 304- 338, Teil 2., Apl. mat. 13 (1968), 388-404. · Zbl 0247.65010
[2] K. Segeth: On universally optimal quadrature formulae involving values of derivatives of integrand. Czech. Math. J. 19 (94) 1969, 605-675. · Zbl 0188.13203
[3] S. L. Sobolev: Introduction into the theory of cubature formulae. Nauka, Moscow 1974 (pp. 808).
[4] I. P. Natanson: The constructive theory of functions. GITTL, Moscow, Leningrad 1949.
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