Abstract
AbstractThe aim of this survey is to present stability results obtained in the last years (roughly after 1995) for the quadratic equation and its various generalizations, and the Drygas equation. The number of papers on this subject is very high, hence, the author of the present chapter made a (quite arbitrary) choice of some of them to be shown in detail. The last section is devoted to an application of stability for solving an alternative form of the quadratic equation.KeywordsUlam–Hyers stabilityQuadratic equationDrygas equationAlternative quadratic equation
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