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QUADRATIC ρ-FUNCTIONAL INEQUALITIES IN NON-ARCHIMEDEAN NORMED SPACES
Yinhua Cui,현윤탁,윤성식 한국수학교육학회 2017 純粹 및 應用數學 Vol.24 No.2
in this paper, we solve the following quadratic rho-functional inequalities \begin{eqnarray} \left\| f\left(\frac{x+y+z}{2}\right)+f\left(\frac{x-y-z}{2}\right)+f\left(\frac{y-x-z}{2}\right)+f\left(\frac{z-x-y}{2}\right) -f(x) -f(y) -f(z) \right\| \leq \| \rho (f(x+y+z) + f(x-y-z) +f(y-x-z)+f(z-x-y) -4f(x)-4f(y)-4f(z)\|, \end{eqnarray} and \begin{eqnarray} \| f(x+y+z) + f(x-y-z)+f(y-x-z)+f(z-x-y) -4f(x)-4f(y) -4f(z) \| \leq \left \| \rho \left( f\left(\frac{x+y+z}{2}\right)+f\left(\frac{x-y-z}{2}\right) +f\left(\frac{y-x-z}{2}\right)+f\left(\frac{z-x-y}{2}\right)-f(x)-f(y)-f(z) \right) \right\|,\end{eqnarray} where rho is a fixed non-Archimedean number with |rho| < |8|. Using the direct method, we prove the Hyers-Ulam stability of the quadratic rho-functional inequalities (0.1) and (0.2) in non-Archimedean Banach spaces and prove the Hyers-Ulam stability of quadratic ρ-functional equations associated with the quadratic rho-functional inequalities (0.1) and (0.2) in non-Archimedean Banach spaces.