Using the fixed point method, we prove the Hyers–Ulam stability of a cubic and quartic functional equation and of an additive and quartic functional equation in matrix Banach algebras.

中文翻译：

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Hyers–Ulam功能不等式的稳定性：定点方法

使用不动点方法，我们证明了矩阵Banach代数中三次和四次函数方程以及加法和四次函数方程的Hyers-Ulam稳定性。