About this article
Published Online: Dec 30, 2015
Page range: 81 - 104
Received: Feb 04, 2015
DOI: https://doi.org/10.1515/aupcsm-2015-0007
© by Zenon Moszner
This work is licensed under the Creative Commons Attribution-ShareAlike 4.0 International License.
We consider the stability, the superstability and the inverse stability of the functional equations with squares of Cauchy’s, of Jensen’s and of isometry equations and the stability in Ulam-Hyers sense of the alternation of functional equations and of the equation of isometry.