Geodesic
On orthogonally additive functions with orthogonally additive second iterate
Commentationes Mathematicae, Tome 53 (2013) no. 2, p. 401−404.

Voir la notice de l'article provenant de la source Annales Societatis Mathematicae Polonae Series

Let $\(E\) be a real inner product space of dimension at least 2. If \(f\) maps \(E\) onto \(E\) and both \(f\) and \(f \circ f \) are orthogonally additive, then \(f\) is additive.
DOI : 10.14708/cm.v53i2.799
Mots-clés : orthogonally additive and additive function, inner product space, iterate 
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Karol Baron. On orthogonally additive functions with orthogonally additive second iterate. Commentationes Mathematicae, Tome 53 (2013) no. 2, p.  401−404. doi : 10.14708/cm.v53i2.799. http://geodesic.mathdoc.fr/articles/10.14708/cm.v53i2.799/

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