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A note on the Hyers-Ulam-Rassias stability of a quadratic equation. (English) Zbl 1067.39039
The authors consider two functional equations of quadratic type and give some interesting results concerning their stability in the spirit of papers of the reviewer [J. Math. Anal. Appl. 184, 431–436 (1994; Zbl 0818.46043)] and W. Jian [J. Math. Anal. Appl. 263, 406–423 (2001; Zbl 0993.39024)].

MSC:
39B82 Stability, separation, extension, and related topics for functional equations
47H14 Perturbations of nonlinear operators
39B52 Functional equations for functions with more general domains and/or ranges
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