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Published online by Cambridge University Press: 20 November 2018
Examining certain problems in physics M. Hosszu [l] obtained the functional equation
(1)
where x, y, f are real.
In another paper M. Hosszu [2] proved that the equation (1) is equivalent to the functional equation of Cauchy; i. e., to the equation
(1)
under the assumption that x is real and f is real and continuous.