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JOURNALS // Itogi Nauki i Tekhniki. Sovremennaya Matematika i ee Prilozheniya. Tematicheskie Obzory // Archive

Itogi Nauki i Tekhniki. Sovrem. Mat. Pril. Temat. Obz., 2022 Volume 212, Pages 57–63 (Mi into1034)

On small solutions of nonlinear operator equations with noninvertible operator in the principal term

R. Yu. Leontiev

Irkutsk State University

Abstract: In this paper, we examine a nonlinear operator equation with vector parameter, which does not satisfy the implicit operator theorem since the operator in the principal term is not continuously invertible at a given point. We prove a sufficient conditions of existing small continuous solution and propose an algorithm of constructing such solution in some domain.

Keywords: Banach space, nonlinear operator, operator equation, continuous solution, sectorial neighborhood of zero.

UDC: 517.988

MSC: 47J99

DOI: 10.36535/0233-6723-2022-212-57-63



© Steklov Math. Inst. of RAS, 2024