Additive f-bimorphisms and Cosine Type Equations
Publications de l'Institut Mathématique, _N_S_62 (1997) no. 76, p. 63 .

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We introduce the notion of an additive $f$-bimorphism, and study the relationship between the cosine functional equation and the additive $f$-bimorphism. Indeed, the former may be characterized in terms of the latter. Moreover, some generalized cosine functional equations are presented, which may be similarly characterized.
Classification : 39B70 39B50
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     author = {C.-S. Lin and Y.J. Cho},
     title = {Additive f-bimorphisms and {Cosine} {Type} {Equations}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {63 },
     publisher = {mathdoc},
     volume = {_N_S_62},
     number = {76},
     year = {1997},
     zbl = {0994.39019},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1997_N_S_62_76_a6/}
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C.-S. Lin; Y.J. Cho. Additive f-bimorphisms and Cosine Type Equations. Publications de l'Institut Mathématique, _N_S_62 (1997) no. 76, p. 63 . http://geodesic.mathdoc.fr/item/PIM_1997_N_S_62_76_a6/