摘要
设A、B同时为Hermite矩阵或斜Hermite矩阵,则(1)tr(AB)m≤tr(AmBm)对一切非负偶数m成立,对一切非负奇数m不一定成立。(2)tr{(AB)m[(AB)*]m}≤tr(A2B2)m对一切自然数m成立。设A为Hermite矩阵,B为斜Hermite矩阵,则对一切非负整数k(1)当m=4k时,有tr(AB)m≤tr(AmBm)(2)当m=4k+2时,有tr(AB)m≥tr(AmBm)(3)当m=4k+1时或4k+3时,tr(AB)m或tr(AmBm)有可能为复数。
In this paper,the following inequalities are proved: (1) Let A,B be Hermite matrices or skew Hermite matrices,then tr (AB) 2k ≤ tr (A 2k B 2k ) tr {(AB) k[(AB) ] k}≤ tr (A 2B 2) kwhere k be nonnegative integer. (2) Let A be a Hermite matrix, B be a Skew Hermite matrix,then tr (AB) 4k ≤ tr (A 4k B 4k ) tr (AB) 4k+2 ≥ tr (A 4k+2 B 4k+2 )where k be nonnegative integer.
出处
《重庆师范学院学报(自然科学版)》
1997年第1期46-51,共6页
Journal of Chongqing Normal University(Natural Science Edition)