On the Functional Equation f(x + y) + f(x - y) = 2f(x)f(y)

DOI10.2307/2313495zbMath0136.12403OpenAlexW4242664829MaRDI QIDQ5510292

Palaniappan Kannappan

Publication date: 1965

Published in: The American Mathematical Monthly (Search for Journal in Brave)

Full work available at URL: https://doi.org/10.2307/2313495

zbMATH Keywords

functional analysis

Mathematics Subject Classification ID

Functional equations and inequalities (39Bxx)

Related Items (3)

D'Alembert's equation and spherical functions ⋮ A functional equation on a vector space ⋮ A note on d'Alembert's functional equation

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