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Convolution Operators and Factorization of Almost Periodic Matrix Functions : Operator Theory: Advances and Applications - Albrecht Böttcher

Convolution Operators and Factorization of Almost Periodic Matrix Functions

By: Albrecht Böttcher, Yuri I. Karlovich, Leiba Rodman

Hardcover | 1 February 2002

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Many problems of the engineering sciences, physics, and mathematics lead to con­ volution equations and their various modifications. Convolution equations on a half-line can be studied by having recourse to the methods and results of the theory of Toeplitz and Wiener-Hopf operators. Convolutions by integrable kernels have continuous symbols and the Cauchy singular integral operator is the most prominent example of a convolution operator with a piecewise continuous symbol. The Fredholm theory of Toeplitz and Wiener-Hopf operators with continuous and piecewise continuous (matrix) symbols is well presented in a series of classical and recent monographs. Symbols beyond piecewise continuous symbols have discontinuities of oscillating type. Such symbols emerge very naturally. For example, difference operators are nothing but convolution operators with almost periodic symbols: the operator defined by (A<p)(x) = L: ak"kX. Moreover, a convolution operator on a finite interval is, in a sense, equivalent to a convolution operator on the half-line whose symbol is a 2 x 2 oscillating matrix function: consideration of the convolution operator with the symbol f(x) on the interval (0, A) leads to the convolution operator with the matrix symbol on the half-line (0,00). Notice that eVl(x) is oscillating even if f(x) is continu­ ous. We finally mention that convolution operators with oscillating symbols have properties that are not shared by operators with continuous or piecewise continu­ ous symbols.

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Non-FictionMathematicsNumber TheoryApplied MathematicsMedicineMedicine in GeneralProbability & StatisticsCalculus & Mathematical AnalysisFunctional Analysis & TransformsEngineering & TechnologyTechnology in GeneralEngineering in General

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Published: 23rd October 2012

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