On two conditional forms of the equation ||f(x + y)|| = ||f(x) + f(y)||.
Aequationes mathematicae, Tome 45 (1993) no. 2-3, pp. 167-178.

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Mots-clés : conditional forms, real linear spaces, strictly normed space
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     author = {Fulvia Skof},
     title = {On two conditional forms of the equation ||f(x + y)|| = ||f(x) + f(y)||.},
     journal = {Aequationes mathematicae},
     pages = {167--178},
     publisher = {mathdoc},
     volume = {45},
     number = {2-3},
     year = {1993},
     zbl = {0776.39003},
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}
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Fulvia Skof. On two conditional forms of the equation ||f(x + y)|| = ||f(x) + f(y)||.. Aequationes mathematicae, Tome 45 (1993) no. 2-3, pp. 167-178. http://geodesic.mathdoc.fr/item/AM2_1993__45_2-3_137519/