Solution to Kim-Rassias's question on stability of generalized Euler-Lagrange quadratic functional equations in quasi-Banach spaces

摘要

By using Aoki-Rolewicz Theorem on p-normalizing a quasi-normed space, we prove stability results for Euler-Lagrange quadratic functional equations in quasi-Banach spaces. These results improve stability results and give the answer to Kim-Rassias's question.(1)