On mappings, orthogonally additive in the Birkhoff-James sense.
On Mikusiński-Pexider functional equation
On Mikusiński's functional equation
On monotonic solutions of some functional equations [Book]
On orthogonally additive mappings.
On orthogonally additive mappings, IV.
On orthogonally additive mappings. (Short Communication).
On products of additive functions.
On products of additive functions (a third approach).
On properties of solutions for two functional equations arising in dynamic programming.
On quadratic and sesquilinear functionals.
On quadratic forms.
On regular solutions of functional equations.
On Reproductive Solutions Of Arbitrary Equations
On reproductive solutions of arbitrary equations.
On ring derivations and quadratic functionals.
On separation theorems for subadditive and superadditive functionals
We generalize the well known separation theorems for subadditive and superadditive functionals to some classes of not necessarily Abelian semigroups. We also consider the problem of supporting subadditive functionals by additive ones in the not necessarily commutative case. Our results are motivated by similar extensions of the Hyers stability theorem for the Cauchy functional equation. In this context the so-called weakly commutative and amenable semigroups appear naturally. The relations between...
On Solving A System Of Balanced Functional Equations Of Quaigroups III
On Solving A System Of Balanced Functional Equations On Quasigroups
On solving a system of balanced functional equations on quasigroups I.