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Continuous Solutions of the Functional Equation f(x + y) + f(x - y) = 2f (x)f(y) - MaRDI portal

Continuous Solutions of the Functional Equation f(x + y) + f(x - y) = 2f (x)f(y) (Q5735493)

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scientific article; zbMATH DE number 3199170
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English
Continuous Solutions of the Functional Equation f(x + y) + f(x - y) = 2f (x)f(y)
scientific article; zbMATH DE number 3199170

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    Continuous Solutions of the Functional Equation f(x + y) + f(x - y) = 2f (x)f(y) (English)
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    1963
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    functional analysis
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