Articles by Author: Iz Iddine El Fassi

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  1. Lipschitz stability of the <em>k</em>-quadratic functional equation

    Lipschitz stability of the <em>k</em>-quadratic functional equation

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    Let ℕ be the set of all positive integers, G an Abelian group with a metric d and E a normed space. For any f : G → E we define the k-quadratic difference of the function f by the...