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JOURNALS // Uchenye Zapiski Kazanskogo Universiteta. Seriya Fiziko-Matematicheskie Nauki // Archive

Uchenye Zapiski Kazanskogo Universiteta. Seriya Fiziko-Matematicheskie Nauki, 2016 Volume 158, Book 4, Pages 511–529 (Mi uzku1383)

Approximate factorization for one class of second-order matrix functions

S. N. Kiyasov

Kazan Federal University, Kazan, 420008 Russia

Abstract: Approximate factorization of Holder matrix function on a simple smooth closed contour has been defined. Components for one class of the $2\times2$ matrix function have been approximated by polynomials in $z$ and $1/z$. Sufficient conditions have been found for zero equality of the partial indices of the approximating matrix function. Factorization of the approximating matrix function has been constructed in an explicit form.

Keywords: matrix function, factorization, approximate factorization.

UDC: 517.544

Received: 11.10.2016



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