The functional equation $f(xy)+f(xy^{-1})=2f(x)f(y)$ for groups
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- by Pl. Kannappan
- Proc. Amer. Math. Soc. 19 (1968), 69-74
- DOI: https://doi.org/10.1090/S0002-9939-1968-0219936-1
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References
- T. M. Flett, Continuous solutions of the functional equation $f(x+y)+f(x-y)=2f(x)f(y)$, Amer. Math. Monthly 70 (1963), 392โ397. MR 149141, DOI 10.2307/2311853 Edwin Hewitt and K. A. Ross, Abstract harmonic analysis, Springer-Verlag, Berlin, 1963.
- Pl. Kannappan, On the functional equation $f(x+y)+f(x-y)=2f(x)f(y)$, Amer. Math. Monthly 72 (1965), 374โ377. MR 180774, DOI 10.2307/2313495
Bibliographic Information
- © Copyright 1968 American Mathematical Society
- Journal: Proc. Amer. Math. Soc. 19 (1968), 69-74
- MSC: Primary 39.38
- DOI: https://doi.org/10.1090/S0002-9939-1968-0219936-1
- MathSciNet review: 0219936