Functional equations on restricted domains.
Le equazioni funzionali in analisi non lineare
On a general principle in geometry that leads to functional equations.
On global transformations of ordinary differential equations of the second order
The paper describes the general form of an ordinary differential equation of the second order which allows a nontrivial global transformation consisting of the change of the independent variable and of a nonvanishing factor. A result given by J. Aczél is generalized. A functional equation of the form is solved on for ,
On the Aleksandrov-Rassias problem and the Hyers-Ulam-Rassias stability problem.
Progress of iteration theory since 1981.
Report of Meeting: Fifteenth international symposium on functional equations. Oberwolfach, May, 22-28, 1977.
Sur deux équations fonctionnelles
Works on functional equations V.