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Quadratic $\rho$-functional inequalities in $\beta$-homogeneous normed spaces | ||
International Journal of Nonlinear Analysis and Applications | ||
مقاله 2، دوره 6، شماره 2، بهمن 2015، صفحه 21-26 اصل مقاله (349.37 K) | ||
نوع مقاله: Research Paper | ||
شناسه دیجیتال (DOI): 10.22075/ijnaa.2015.229 | ||
نویسندگان | ||
Choonkil Park1؛ Sang Og Kim2؛ Jung Rye Lee* 3؛ Dong Yun Shin4 | ||
1Department of Mathematics, Research Institute for Natural Sciences, Hanyang University, Seoul 133-791, Korea | ||
2Department of Mathematics, Hallym University, Chuncheon 200-7021, Korea | ||
3Department of Mathematics, Daejin University, Kyeonggi 487-711, Korea | ||
4Department of Mathematics, University of Seoul, Seoul 130-743, Korea | ||
تاریخ دریافت: 22 خرداد 1393، تاریخ بازنگری: 19 دی 1393، تاریخ پذیرش: 22 اسفند 1393 | ||
چکیده | ||
In [12], Park introduced the quadratic $\rho$-functional inequalities \begin{eqnarray}\label{E01} && \|f(x+y)+f(x-y)-2f(x)-2f(y)\| \\ && \qquad \le \left\|\rho\left(2 f\left(\frac{x+y}{2}\right) + 2 f\left(\frac{x-y}{2}\right)- f(x) - f(y)\right)\right\|, \nonumber \end{eqnarray} where $\rho$ is a fixed complex number with $|\rho|<1$, and \begin{eqnarray}\label{E02} && \left\|2 f\left(\frac{x+y}{2}\right) + 2 f\left(\frac{x-y}{2}\right)- f(x) - f(y)\right\| \\ && \qquad \le \|\rho(f(x+y)+f(x-y)-2f(x)-2f(y))\| , \nonumber \end{eqnarray} where $\rho$ is a fixed complex number with $|\rho|<\frac{1}{2}$. In this paper, we prove the Hyers-Ulam stability of the quadratic $\rho$-functional inequalities (0.1) and (0.2) in $\beta$-homogeneous complex Banach spaces and prove the Hyers-Ulam stability of quadratic $\rho$-functional equations associated with the quadratic $\rho$-functional inequalities(0.1) and (0.2) in $\beta$-homogeneous complex Banach spaces. | ||
کلیدواژهها | ||
Hyers-Ulam stability؛ $\beta$-homogeneous space؛ quadratic $\rho$-functional equation؛ quadratic $\rho$-functional inequality | ||
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