在这份报纸,我们在戒指 R 调查元素的 Drazin 逆的添加剂结果。在条件 ab = ba 下面,我们证明 + b 是 Drazin 可颠倒如果并且仅当 aa D (a+b) 是 Drazin 可颠倒,在上标 D 意味着 Drazin 逆的地方。而且,我们发现表情(+ b ) D 。作为应用,我们为 2 的 Drazin 逆给一些新代表
In this paper, we investigate additive results of the Drazin inverse of elements in a ring R. Under the condition ab = ha, we show that a + b is Drazin invertible if and only if aaD (a + b) is Drazin invertible, where the superscript D means the Drazin inverse. Furthermore we find an expression of (a + b)D. As an application we give some new representations for the Drazin inverse of a 2 × 2 block matrix.