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JOURNALS // Matematicheskii Sbornik // Archive

Mat. Sb., 2022 Volume 213, Number 1, Pages 3–45 (Mi sm9483)

This article is cited in 7 papers

Global and semilocal theorems on implicit and inverse functions in Banach spaces

A. V. Arutyunov, S. E. Zhukovskiy

V. A. Trapeznikov Institute of Control Sciences of Russian Academy of Sciences, Moscow, Russia

Abstract: We consider continuous mappings between two Banach spaces that depend on a parameter with values in a topological space. These mappings are assumed to be continuously differentiable for each value of the parameter. Under normality (regularity) assumptions of the mappings under consideration, we obtain sufficient conditions for the existence of global and semilocal implicit functions. A priori estimates for solutions are given. As an application of these results, we obtain, in particular, a theorem on extending an implicit function from a given closed set to the whole parameter space and a theorem on coincidence points of mappings.
Bibliography: 32 titles.

Keywords: global implicit function, semilocal implicit function, global inversion function theorem, normality condition, continuous extension of an implicit function.

UDC: 517.275

MSC: 47J07, 54H25, 26B10

Received: 23.07.2020 and 21.02.2021

DOI: 10.4213/sm9483


 English version:
Sbornik: Mathematics, 2022, 213:1, 1–41

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© Steklov Math. Inst. of RAS, 2024