Abstract
This article deals with trigonometric functional equations on hypergroups. We describe the general continuous solution of sine and cosine addition formulas and a so-called sine-cosine functional equation on a locally compact hypergroup in terms of exponential functions, sine functions, and second-order generalized moment functions.
Citation
Żywilla Fechner. László Székelyhidi. "Sine and cosine equations on hypergroups." Banach J. Math. Anal. 11 (4) 808 - 824, October 2017. https://doi.org/10.1215/17358787-2017-0018
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