Solvability of nonlinear degenerate equations and estimates for inverse functions

For a continuous map $F$ from a finite-dimensional real space to another such space the question of the solvability of the nonlinear equation of the form $F(x)=y$ is investigated for $y$ close to a fixed value $F(\overline x)$. To do this, the concept of $\lambda$-truncation of the map $F$ in a neig...

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Bibliographic Details
Published inSbornik. Mathematics Vol. 216; no. 1; pp. 1 - 24
Main Authors Arutyunov, Aram Vladimirovich, Zhukovskiy, Sergey Evgenevich
Format Journal Article
LanguageEnglish
Published 2025
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Summary:For a continuous map $F$ from a finite-dimensional real space to another such space the question of the solvability of the nonlinear equation of the form $F(x)=y$ is investigated for $y$ close to a fixed value $F(\overline x)$. To do this, the concept of $\lambda$-truncation of the map $F$ in a neighbourhood of the point $\overline x$ is introduced and examined. A theorem on the uniqueness of a $\lambda$-truncation is proved. The regularity condition is introduced for $\lambda$-truncations; it is shown to be sufficient for the solvability of the equation in question. A priori estimates for the solution are obtained. Bibliography: 16 titles.
ISSN:1064-5616
1468-4802
DOI:10.4213/sm10060e