Stability of a bi-Jensen functional equation. II.
Stability of a Cauchy-Jensen functional equation in quasi-Banach spaces.
Stability of a functional equation coming from the characterization of the absolute value of additive functions.
Stability of a functional equation deriving from cubic and quartic functions.
Stability of a functional equation related to distance measure. II.
Stability of a generalization of the Fréchet functional equation
We prove some stability and hyperstability results for a generalization of the well known Fréchet functional equation, stemming from one of the characterizations of the inner product spaces. As the main tool we use a fixed point theorem for some function spaces. We end the paper with some new inequalities characterizing the inner product spaces.
Stability of a generalized Euler-Lagrange type additive mapping and homomorphisms in -algebras.
Stability of a generalized Euler-Lagrange type additive mapping and homomorphisms in -algebras.
Stability of a generalized mixed type additive, quadratic, cubic and quartic functional equation.
Stability of a Jensen type functional equation.
Stability of a Jensen type logarithmic functional equation on restricted domains and its asymptotic behaviors.
Stability of a mixed type functional equation on multi-Banach spaces: a fixed point approach.
Stability of a quadratic functional equation in the spaces of generalized functions.
Stability of a time discrete perturbed dynamical systems with delay.
Stability of an additive-cubic-quartic functional equation.
Stability of an additive-quadratic functional equation of two variables in F-spaces.
Stability of approximate quadratic mappings.
Stability of cubic functional equation in the spaces of generalized functions.
Stability of difference analogue of linear mathematical inverted pendulum.
Stability of difference equations and applications to robustness problems.