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Stability of a quartic functional equation.


ABSTRACT: We obtain the general solution of the generalized quartic functional equation f(x + my) + f(x - my) = 2(7m - 9)(m - 1)f(x) + 2m²(m² - 1)f(y)-(m - 1)² f(2x) + m²{f(x + y) + f(x - y)} for a fixed positive integer m. We prove the Hyers-Ulam stability for this quartic functional equation by the directed method and the fixed point method on real Banach spaces. We also investigate the Hyers-Ulam stability for the mentioned quartic functional equation in non-Archimedean spaces.

SUBMITTER: Bodaghi A 

PROVIDER: S-EPMC3922033 | biostudies-other | 2014

REPOSITORIES: biostudies-other

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