Summary.
We describe the set of solutions of Wilson’s functional equation on any step 2 nilpotent group and how the set of classical solutions in certain cases must be supplemented by 4-dimensional spaces of solutions.
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Stetkær, H. D’Alembert’s and Wilson’s functional equations on step 2 nilpotent groups . Aequ. math. 67, 241–262 (2004). https://doi.org/10.1007/s00010-003-2715-5
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DOI: https://doi.org/10.1007/s00010-003-2715-5