Abstract:
In the present paper, we prove a fixed-point theorem for completely continuous multivalued mappings defined on a bounded convex closed subset XX of the Hilbert space HH which satisfies the tangential condition F(x)∩(x+TX(x))≠∅, where TX(x) is the cone tangent to the set X at a point x. The proof of this theorem is based on the method of single-valued approximations to multivalued mappings. In this paper, we consider a simple approach for constructing single-valued approximations to multivalued mappings. This approach allows us not only to simplify the proofs of already-known theorems, but also to obtain new statements needed to prove the main theorem in this paper.
This publication is cited in the following 8 articles:
Yu. E. Gliklikh, “Stochastic Equations and Inclusions with Mean Derivatives and Their Applications”, J Math Sci, 282:2 (2024), 111
Yu. E. Gliklikh, “Stokhasticheskie uravneniya i vklyucheniya s proizvodnymi v srednem i ikh prilozheniya”, SMFN, 68, no. 2, Rossiiskii universitet druzhby narodov, M., 2022, 191–337
T. N. Fomenko, “Zeros of Functionals and a Parametric Version of Michael Selection Theorem”, Lobachevskii J Math, 43:3 (2022), 564
B. D. Gel'man, “A Hybrid Fixed-Point Theorem for Set-Valued Maps”, Math. Notes, 101:6 (2017), 951–959
B. D. Gel'man, “A version of the infinite-dimensional Borsuk-Ulam theorem for multivalued maps”, Sb. Math., 207:6 (2016), 841–853
Arutyunov A., Gelman B., Obukhovskii V., “a Coincidence Theorem For Multivalued Maps and Its Applications”, J. Fixed Point Theory Appl., 17:2 (2015), 331–340
Hichem Ben-El-Mechaiekh, Fixed Point Theory, Variational Analysis, and Optimization, 2014, 77
B. D. Gel'man, “On the Cauchy Problem for a Class of Degenerate Differential Equations with Lipschitz Right-Hand Side”, Funct. Anal. Appl., 42:3 (2008), 227–229