Journal
BULLETIN OF THE KOREAN MATHEMATICAL SOCIETY
Volume 46, Issue 2, Pages 387-400Publisher
KOREAN MATHEMATICAL SOC
DOI: 10.4134/BKMS.2009.46.2.387
Keywords
Hyers-Ulam-Rassias stability; Cauchy equation; Jensen equation; Jordan-von Neumann-type Jensen inequality
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We establish a new strategy to study the Hyers-Ulam-Rassias stability of the Cauchy and Jensen equations in non-Archimedean normed spaces. We will also show that under some restrictions, every function which satisfies certain inequalities can be approximated by an additive mapping in non-Archimedean normed spaces. Some applications of our results will be exhibited. In particular, we will see that some results about stability and additive mappings in real normed spaces are not valid in non-Archimedean normed spaces.
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