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Kannappan’s functional equation on semigroups with involution

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Abstract

We express the complex-valued solutions of Kannappan’s functional equation on semigroups with involution in terms of solutions of d’Alembert’s functional equation.

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Authors and Affiliations

  1. Department of Mathematics, Aarhus University, Ny Munkegade 118, 8000, Aarhus C, Denmark

    Henrik Stetkær

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  1. Henrik Stetkær
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Correspondence to Henrik Stetkær.

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Communicated by Jimmie D. Lawson.

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Stetkær, H. Kannappan’s functional equation on semigroups with involution. Semigroup Forum 94, 17–30 (2017). https://doi.org/10.1007/s00233-015-9756-7

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  • DOI: https://doi.org/10.1007/s00233-015-9756-7

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