Abstract
If \({f, g : G \to \mathbb{C}}\), f ≠ 0, is a solution of Wilson’s functional equation on a group G, then g is a d’Alembert function.
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Stetkær, H. A link between Wilson’s and d’Alembert’s functional equations. Aequat. Math. 90, 407–409 (2016). https://doi.org/10.1007/s00010-015-0336-4
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DOI: https://doi.org/10.1007/s00010-015-0336-4