Numerical range and related nonlinear functional equations
On a Cauchy-Jensen functional inequality.
On a characterization of polynomials by divided differences.
On a characterization of polynomials by divided differences. (Summary).
On a characterization of symmetric stable processes.
On a characterization of symmetric stable processes. (Short Communication).
On a Conditional Cauchy-type Functional Equation Involving Powers
We solve the functional equation f(x^m + y) = f(x)^m + f(y) in the realm of polynomials with integer coefficients.
On a cubic equation and a Jensen-quadratic equation.
On a Cubic Functional Equation defined on Groups.
On a functional equation arising from hyperbolic geometry.
On a Functional Equation Arising from the Monteiro-Botelho-Teixeira Axioms for a Topological Space
On a Functional Equation Arising from the Monteiro-Botelho-Teixeira Axioms for a Topological Space (Short Communication)
On a functional equation of Swiatak on groups.
On a functional equation related to the Cauchy equation
On a functional inequality arising in the construction of the product of several metric spaces.
On a Functional Which is Quadratic on A-orthogonal Vectors
On a general Hyers-Ulam stability result.
On a general principle in geometry that leads to functional equations.
On a generalization of the Cauchy functional equation.
On a joint generalization of Cauchy's and d'Alembert's functional equations.