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Additive s-functional inequality and hom-derivations in Banach algebras

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Abstract

In this paper, we introduce and solve the following additive s-functional inequality:

$$\begin{aligned} \left\| f\left( x+y\right) - f(x )- f(y)\right\| \le \Vert s (f(x-y)-f(x)-f(-y))\Vert , \end{aligned}$$
(0.1)

where s is a fixed nonzero complex number with \(|s|<1\). Using the fixed point method and the direct method, we prove the Hyers–Ulam stability of the additive s-functional inequality (0.1) in complex Banach spaces. Furthermore, we prove the Hyers–Ulam stability of hom-derivations in complex Banach algebras.

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Acknowledgements

This research was supported by the Daejin University Research Grant.

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Authors and Affiliations

  1. Research Institute for Natural Sciences, Hanyang University, Seoul, 04763, Republic of Korea

    Choonkil Park

  2. Department of Mathematics, Daejin University, Kyunggi, 11159, Republic of Korea

    Jung Rye Lee

  3. Department of Mathematics, School of Arts and Sciences, Shaanxi University of Science and Technology, Xi’an, People’s Republic of China

    Xiaohong Zhang

  4. Department of Mathematics, College of Arts and Sciences, Shanghai Maritime University, Shanghai, People’s Republic of China

    Xiaohong Zhang

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  1. Choonkil Park
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  3. Xiaohong Zhang
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Correspondence to Jung Rye Lee.

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Park, C., Lee, J.R. & Zhang, X. Additive s-functional inequality and hom-derivations in Banach algebras. J. Fixed Point Theory Appl. 21, 18 (2019). https://doi.org/10.1007/s11784-018-0652-0

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  • DOI: https://doi.org/10.1007/s11784-018-0652-0

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