Chebyshev Splines and Kolmogorov Inequalities, Softcover reprint of the original 1st ed. 1998 Operator Theory: Advances and Applications Series, Vol. 105

This monograph describes advances in the theory of extremal problems in classes of functions defined by a majorizing modulus of continuity w. In particular, an extensive account is given of structural, limiting, and extremal properties of perfect w-splines generalizing standard polynomial perfect splines in the theory of Sobolev classes. In this context special attention is paid to the qualitative description of Chebyshev w-splines and w-polynomials associated with the Kolmogorov problem of n-widths and sharp additive inequalities between the norms of intermediate derivatives in functional classes with a bounding modulus of continuity. Since, as a rule, the techniques of the theory of Sobolev classes are inapplicable in such classes, novel geometrical methods are developed based on entirely new ideas. The book can be used profitably by pure or applied scientists looking for mathematical approaches to the solution of practical problems for which standard methods do not work. The scope of problems treated in the monograph, ranging from the maximization of integral functionals, characterization of the structure of equimeasurable functions, construction of Chebyshev splines through applications of fixed point theorems to the solution of integral equations related to the classical Euler equation, appeals to mathematicians specializing in approximation theory, functional and convex analysis, optimization, topology, and integral equations.

0 Introduction.- 1 Auxiliary Results.- 2 Maximization of Functionals in H? [a, b] and Perfect ?-Splines.- 3 Fredholm Kernels.- 4 Review of Classical Chebyshev Polynomial Splines.- 5 Additive Kolmogorov-Landau Inequalities.- 6 Proof of the Main Result.- 7 Properties of Chebyshev ?-Splines.- 8 Chebyshev ?-Splines on the Half-line ?+.- 9 Maximization of Integral Functional in H?[a1, a2], -? ? a1 < a2 ? +?.- 10 Sharp Kolmogorov Inequalities in WrH?(?).- 11 Landau and Hadamard Inequalities in WrH?(?+) and WrH?(?).- 12 Sharp Kolmogorov-Landau inequalities in W2H?(?) AND W2H?(?+.- 13 Chebyshev ?-Splines in the Problem of N-Width of the Functional Class WrH?[0, 1].- 14 Function in WrH?[-1, 1] Deviating Most from Polynomials of Degree r.- 15 N-Widths of the Class WrH?[-1, 1].- 16 Lower Bounds for the N-Widths of the Class WrH?[n].- Appendix A Kolmogorov Problem for Functions.- A.3 Sufficient conditions of extremality in the problem (K - L).- A.3.1 Corollaries of differentiation formulas.- A.3.2 Extremality conditions in the form of an operator equation.- A.4.2 Solution of the problem (K).- A.4.3 Problem (K) in the Hölder classes.- B.1 Preliminary remarks.- B.2 Maximization of the norm.- B.2.1 Differentiation formulae and inequalities.- B.3 Maximization of the norm.- B.4 Maximization of the norm.- B.5 Maximization of the norm.