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Advances in Difference Equations

, 2009:503724

First Online: 10 November 2009Received: 22 August 2009Accepted: 06 November 2009

Abstract

We will investigate the superstability of the hyperbolic trigonometric functional equation from the following functional equations: Open image in new window, Open image in new window, Open image in new window, Open image in new window, which can be considered the mixed functional equations of the sine function and cosine function, of the hyperbolic sine function and hyperbolic cosine function, and of the exponential functions, respectively.

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Autor: Gwang Hui Kim

Fuente: https://link.springer.com/







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