Fixed points and the stability of quadratic functional equations. (English) Zbl 1103.39304

Summary: We will present a fixed point method for some stability theorems of functional equations of quadratic type.


39B62 Functional inequalities, including subadditivity, convexity, etc.
39B72 Systems of functional equations and inequalities
39B82 Stability, separation, extension, and related topics for functional equations
47H09 Contraction-type mappings, nonexpansive mappings, \(A\)-proper mappings, etc.