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On the best Ulam constant of a higher order linear difference equation
Bulletin des Sciences Mathématiques ( IF 1.3 ) Pub Date : 2020-11-11 , DOI: 10.1016/j.bulsci.2020.102928 Alina Ramona Baias , Dorian Popa
中文翻译:
关于高阶线性差分方程的最佳Ulam常数
更新日期:2020-11-16
Bulletin des Sciences Mathématiques ( IF 1.3 ) Pub Date : 2020-11-11 , DOI: 10.1016/j.bulsci.2020.102928 Alina Ramona Baias , Dorian Popa
In a Banach space X the linear difference equation with constant coefficients , is Ulam stable if and only if the roots , , of its characteristic equation do not belong to the unit circle. If , , we prove that the best Ulam constant of this equation is , where and , , are Vandermonde determinants.
中文翻译:
关于高阶线性差分方程的最佳Ulam常数
在Banach空间X中具有常数系数的线性差分方程,且仅当根源有效时,Ulam才稳定 , 的特征方程的,不属于单位圆。如果, ,我们证明这个方程式的最佳Ulam常数是 ,在哪里 和 , 是范德蒙德的行列式。