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Unstable (Stable) system of stable (unstable) functional equations
(2010)
In this note the answer to a question by Z. Moszner from the paper [1] about connections of stability of separate
equations and the system of them, is given.
On stability of some functional equations and topology of their target spaces
(2012)
Some remarks about the coherence of the stability of several functional equations with topology of their target
spaces are given. The equations in question are: homogeneity (first of all) and quadratic ones, as well as ...