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Quadrature n° 74 (2009) 27-34
DOI: 10.1051/quadrature/2009019
Équation fonctionnelle de la tangente hyperbolique et parties de 
additivement stables
Roger Cuculière Published online: 4 September 2009
Abstract
Quelles sont les fonctions qui vérifient la formule d'addition pour la
fonction tangente hyperbolique? Cette question anodine est l'objet de
nombreux exercices "faciles" d'équations fonctionnelles et pourtant
un traitement rigoureux de cette équation et de sa résolution nous
amène à étudier les sous-groupes et les parties additivement
stables de
pour décrire quelques
solutions monstrueuses.
© EDP Sciences 2009
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