Abstract
In this paper, we study whether the set A(ϕ) is closed under multiplication f · g, where f and g belong to the class A(ϕ). We also study the problem of the existence of a solution of the equation Bx = C (where B,C ∈ A(ϕ) and B ≠ 0) on the set A(ϕ).
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Translated from Matematicheskie Zametki, vol. 80, no. 2, 2006, pp. 296–308.
Original Russian Text Copyright © 2006 by V. Tsagareishvili.
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Tsagareishvili, V. On the structure of the class A(ϕ). Math Notes 80, 284–295 (2006). https://doi.org/10.1007/s11006-006-0137-0
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DOI: https://doi.org/10.1007/s11006-006-0137-0