Abstract
The groups all of whose elements are involutions are characterized by means of two equivalent composite functional equations in two variables.
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Pinelis, I. Characterization of groups of involutions by means of composite functional equations in two variables. Acta Math. Hungar. 165, 287–290 (2021). https://doi.org/10.1007/s10474-021-01191-1
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DOI: https://doi.org/10.1007/s10474-021-01191-1