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- W2065529180 abstract "It is well known that a Toeplitz operator is invertible if and only if its symbols admits a canonical Wiener–Hopf factorization, where the factors satisfy certain conditions. A similar result holds also for singular integral operators. More generally, the dimension of the kernel and cokernel of Toeplitz or singular integral operators which and Fredholm operators can be expressed in terms of the partial indices ϰ1,…,ϰN∈Z of an associated Wiener–Hopf factorization problem. In this paper we establish corresponding results for Toeplitz plus Hankel operators and singular integral operators with flip under the assumption that the generating functions are sufficiently smooth (e.g., Hölder continuous). We are led to a slightly different factorization problem, in which pairs (ϱ1,ϰ1),…,(ϱN,ϰN)∈{−1,1}×Z, instead of the partial indices appear. These pairs provide the relevant information about the dimension of the kernel and cokernel and thus answer the invertibility problem." @default.
- W2065529180 created "2016-06-24" @default.
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- W2065529180 date "2004-03-01" @default.
- W2065529180 modified "2023-10-16" @default.
- W2065529180 title "Invertibility theory for Toeplitz plus Hankel operators and singular integral operators with flip" @default.
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- W2065529180 doi "https://doi.org/10.1016/s0022-1236(03)00113-7" @default.
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