A Continuous Method for Finding a Generalized Fixed Point of a Nonexpansive Mapping on a Set in a Hilbert Space
Irina P. Ryazantseva · Differential Equations · 2023
Abstract We introduce the concept of a generalized fixed point of a nonexpansive operator on a convex closed set in a Hilbert space. To find this point, we construct a regularizing algorithm in the form of the Cauchy problem for a first-order differential equation and establish sufficient conditions for the strong convergence of the resulting approximations to a normal generalized fixed point under approximate specification of the nonexpansive operator and the convex closed set on which the desired generalized fixed point of the operator is located. Examples of parametric functions are given that ensure the convergence of the approximations in the norm of the Hilbert space to a normal generalized fixed point of the operator on the convex closed set in this space.