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Singular integral operators with piecewise continuous coefficients in reflexive rearrangement-invariant spaces

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Abstract

The paper is devoted to some only recently uncovered phenomena emerging in the study of singular integral operators (SIO's) with piecewise continuous (PC) coefficients in reflexive rearrangement-invariant spaces over Carleson curves. We deal with several kinds of indices of submultiplicative functions which describe properties of spaces (Boyd and Zippin indices) and curves (spirality indices). We consider some “disintegration condition” which combines properties of spaces and curves, the Boyd and spirality indices.

We show that the essential spectrum of SIO associated with the Riemann boundary value problem with PC coefficient arises from the essential range of the coefficient by filling in certain massive connected sets (so-called logarithmic leaves) between the endpoints of jumps.

These results combined with the Allan-Douglas local principle and with the two projections theorem enable us to study the Banach algebra\(\mathfrak{A}\) generated by SIO's with matrix-valued piecewise continuous coefficients. We construct a symbol calculus for this Banach algebra which provides a Fredholm criterion and gives a basis for an index formula for arbitrary SIO's from\(\mathfrak{A}\) in terms of their symbols.

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Authors and Affiliations

  1. Department of Mathematics and Physics, South Ukrainian State Pedagogical University, Staroportofrankovskaya st., 26, 270020, Odessa, Ukraine

    Alexei Yu. Karlovich

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Karlovich, A.Y. Singular integral operators with piecewise continuous coefficients in reflexive rearrangement-invariant spaces. Integr equ oper theory 32, 436–481 (1998). https://doi.org/10.1007/BF01194990

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