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A generalization of the cosine addition law on semigroups |
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| Authors: | Aserrar Youssef Elqorachi Elhoucien |
| Institution: | 1.Department of Mathematics, Faculty of Sciences, Ibn Zohr University, Agadir, Morocco ; |
| Abstract: | Aequationes mathematicae - Our main result is that we describe the solutions $$g,f:S\rightarrow \mathbb {C}$$ of the functional equation $$\begin{aligned} g(x\sigma (y))=g(x)g(y)-f(x)f(y)+\alpha... |
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