PUBLICATIONS DE L'INSTITUT MATHÉMATIQUE (BEOGRAD) (N.S.) Vol. 62 (76), pp. 6368 (1997) 

Additive $f$bimorphisms and cosine type equationsC.S. Lin and Y.J. ChoDepartment of Mathematics, Bishop's University Lennoxville, P.Q. J1M 1Z7, CanadaAbstract: 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 (MSC2000): 39B70; 39B50 Full text of the article:
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