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Unstable (stable) system of stable (unstable) functional equations. (English) Zbl 1298.39028
The authors answer a question of the second author [Aequationes Math. 77, No. 1–2, 33–88 (2009; Zbl 1207.39044)], related to connection of stability of separate equations and the system of them. This is a good paper.

MSC:
39B82 Stability, separation, extension, and related topics for functional equations
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