Geodesic
On the stability of the squares of some functional equations
Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica, no. 14 (2015)

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We consider the stability, the superstability and the inverse stability of the functional equations with squares of Cauchy’s, of Jensen’s and of isometry equations and the stability in Ulam-Hyers sense of the alternation of functional equations and of the equation of isometry. 
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     author = {Moszner, Zenon},
     title = {On the stability of the squares of some functional equations},
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     url = {http://geodesic.mathdoc.fr/item/AUPCM_2015_14_a5/}
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Moszner, Zenon. On the stability of the squares of some functional equations. Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica, no. 14 (2015). http://geodesic.mathdoc.fr/item/AUPCM_2015_14_a5/