On generalized hyperbolic functions and their characterization by functional equations.
On a characterization of polynomials by divided differences. (Summary).
On a characterization of polynomials by divided differences.
Some remarks on the stability of the multi-Jensen equation
First a stability result of Prager-Schwaiger [Prager W., Schwaiger J., Stability of the multi-Jensen equation, Bull. Korean Math. Soc., 2008, 45(1), 133–142] is generalized by admitting more general domains of the involved function and by allowing the bound to be not constant. Next a result by Cieplinski [Cieplinski K., On multi-Jensen functions and Jensen difference, Bull. Korean Math. Soc., 2008, 45(4), 729–737] is discussed. Finally a characterization of the completeness of a normed space in...
Über einen Satz von Shl. Sternberg in der Theorie der analytischen Iterationen.
Linearisierung formal-biholomorpher Abbildungen und Interationsprobleme.
Über algebraische Relationen zwischen additiven und multiplikativen Funktionen.
On the stabiltiy of a system of functional equations characterizing generalize hyperbolic and trigonometric functions.
A characterization of damped and undamped harmonic oscillations by a superposition property II.
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