A conjecture of Gy. Petruska.
A Cosine Functional Equation with Restricted Argument. (Short Communication).
A Functional Equation with Differences
A Functional Inequality for Entire Functions Generalizing the Sine Functional Equation. (Short Communication).
A generalization of a theorem of S. Gołąb and M. Kucharzewski
A generalization of Ostrowski' theorem on ultrametric inequalities.
A necessary and sufficient condition for continuity of additive functions
A note on a pentomino functional equation
A note on certain functional determinants.
A note on certain functional determinants. (Summary).
A Proof of the Equivalence of the Equation f (x + y - xy) + f (xy) = f (x) + f (y) and Jensen's Functional Equation. (Short Communication).
A Proof of theEquivalence of the Equation f(x+y-xy)+f(xy) = f(x) + (y) and Jensen's Functional Equa tion
A remark on -systems in groups
A special solution of the inhomogeneous Schröder equation.
A uniqueness criterion for fractional iteration
Aczél's Uniqueness Theorem and Cellular Internity.
Aczél's Uniqueness theorem and Cellular Internity. (Short Communication).
Addition Formulae for Field-Valued Continuous Functions on Topological Groups.
All General Solutions of Finite Equations
An algebraic functional equation