Nearly ring homomorphisms and nearly ring derivations on non-Archimedean Banach algebras.
New generalizations of the Poisson kernel.
Nonlinear Functional Equations and Eigenvalue Problems in Nonseperable Banach Spaces
Nonlinear functional equations and their Baire category properties.
Nonlinear -random stability of an ACQ functional equation.
Nonlinear stability of a quadratic functional equation with complex involution
Let be complex vector spaces. Recently, Park and Th.M. Rassias showed that if a mapping satisfies for all , , then the mapping satisfies for all , . Furthermore, they proved the generalized Hyers-Ulam stability of the functional equation () in complex Banach spaces. In this paper, we will adopt the idea of Park and Th. M. Rassias to prove the stability of a quadratic functional equation with complex involution via fixed point method.
Non-negative continuous solutions of a functional inequality
Non-trivial solutions to certain matrix equations.
Nonwhere differentiable solutions of a system of functional equations. (Summary).
Normenquadrat Über Gruppen
Note on a functional equation
Note on a functional equation related to the power means.
Note on almost additive functions.
Note on commutable functions.
Note on Continuous Solutions of a Functional Equation.
Note on initial topologies on rational vector spaces induced by revalued linear mappings.
Note on measures
Note on simultaneous solutions of a system of Schröder's equations
We investigate simultaneous solutions of a system of Schroder's functional equations. Under certain assumptions these solutions are used in transformations of functional-differential equations the initial set of which consists of the initial point only.
Note on the differentiability of solutions of class Cr of a functional equation with respect to a parameter.
Note on the equation (...-...)f = 0.