| This article must adhere to the biographies of living persons (BLP) policy, even if it is not a biography, because it contains material about living persons. Contentious material about living persons that is unsourced or poorly sourced must be removed immediately from the article and its talk page, especially if potentially libellous. If such material is repeatedly inserted, or if you have other concerns, please report the issue to this noticeboard.If you are a subject of this article, or acting on behalf of one, and you need help, please see this help page. |
 | This article is rated Start-class on Wikipedia's content assessment scale. It is of interest to the following WikiProjects: | ||||||||||
| |||||||||||
improving page finding resistance
editThis article recently attracted a number of useful edits by several users that provided more references and sources for further study. The interested reader is referred to the following standard references:
1) Chapter 6 "Stability" (pp.295-327) of the book: Pl. Kannappan, Functional Equations and Inequalities with Applications, Springer, 2009
2) The entire book: S.-M. Jung, Hyers-Ulam-Rassias Stability of Functional Equations in Nonlinear Analysis, Springer, New York, 2011
3) The book: D.H. Hyers, G. Isac and Th.M. Rassias, Stability of Functional Equations in Several Variables, Birkhauser, Basel, 1998