Summary.
The Hyers–Ulam stability of the functional inequality
$$ ||2f(x) + 2f(y) - f(x - y)|| \leq ||f(x + y)|| \quad \left( {{\text{for all x, y}}} \right) $$
is investigated.
Similar content being viewed by others
Author information
Authors and Affiliations
Corresponding author
Additional information
Manuscript received: July 20, 2004 and, in final form, December 15, 2004.
Rights and permissions
About this article
Cite this article
Fechner, W. Stability of a functional inequality associated with the Jordan – von Neumann functional equation. Aequ. math. 71, 149–161 (2006). https://doi.org/10.1007/s00010-005-2775-9
Issue Date:
DOI: https://doi.org/10.1007/s00010-005-2775-9