Geodesic
On a functional equation related to the Ptolemaic inequality.
Aequationes mathematicae, Tome 34 (1987), pp. 298-303.

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Mots-clés : Ptolemaic inequality, normed linear space, inner product space, involution, symmetric bilinear functional 
@article{AM2_1987__34_137247,
     author = {C. Alsina and J.L. Garcia-Roig},
     title = {On a functional equation related to the {Ptolemaic} inequality.},
     journal = {Aequationes mathematicae},
     pages = {298--303},
     publisher = {mathdoc},
     volume = {34},
     year = {1987},
     zbl = {0658.39003},
     url = {http://geodesic.mathdoc.fr/item/AM2_1987__34_137247/}
}
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C. Alsina; J.L. Garcia-Roig. On a functional equation related to the Ptolemaic inequality.. Aequationes mathematicae, Tome 34 (1987), pp. 298-303. http://geodesic.mathdoc.fr/item/AM2_1987__34_137247/