Functional Equations and Inequalities

On the Stability of a Functional Equation for Generalized Trigonometric Functions.
Some Notes on Two-Scale Difference Equations.
Some Demand Functions in a Duopoly Market with Advertising.
Solutions of a Functional Inequality in a Special Class of Functions.
On Dependence of Lipschitzian Solutions of Nonlinear Functional Inequality on an Arbitrary Function.
The Problem of Expressibility in Some Extensions of Free Groups.
On a Pythagorean Functional Equation Involving Certain Number Fields.
On a Conditional Cauchy Functional Equation Involving Cubes.
Hyers-Ulam Stability of Hosszú’s Equation.
The Functional Equation of the Square Root Spiral.
On the Superstability of the Functional Equation f(xy)=f(x)y.
Replicativity and Function Spaces.
Normal Distributions and the Functional Equation f(x+y) g(x-y) = f(x)f(y)g(x)g(-y).
On the Polynomial-Like Iterative Functional Equation.
Distribution of Zeros and Inequalities for Zeros of Algebraic Polynomials.
A Functional Definition of Trigonometric Functions.
A Qualitative Study of Lobachevksy’s Complex Functional Equation.
Smooth Solutions of an Iterative Functional Equation.
Set-Valued Quasiconvex Functions and their Constant Selections.
Entire Solutions of the Hille-type Functional Equation.
Ulam’s Problem, Hyers’s Solution — and to Where they Led.
A Separation Lemma for the Construction of Finite Sums Decompositions.
Aleksandrov Problem and Mappings which Preserve Distances.
On Some Subclasses of Harmonic Functions.