Geodesic
On the stabiltiy of a system of functional equations characterizing generalize hyperbolic and trigonometric functions.
Aequationes mathematicae, Tome 45 (1993) no. 2-3, pp. 285-296.

Voir la notice de l'article provenant de la source European Digital Mathematics Library

Mots-clés : stability, system of functional equations, hyperbolic functions, trigonometric functions 
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     title = {On the stabiltiy of a system of functional equations characterizing generalize hyperbolic and trigonometric functions.},
     journal = {Aequationes mathematicae},
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     publisher = {mathdoc},
     volume = {45},
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     year = {1993},
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Jens Schwaiger; Wolfgang Förg-Rob. On the stabiltiy of a system of functional equations characterizing generalize hyperbolic and trigonometric functions.. Aequationes mathematicae, Tome 45 (1993) no. 2-3, pp. 285-296. http://geodesic.mathdoc.fr/item/AM2_1993__45_2-3_137529/