推论 5.5

推论 5.5.

若 $\mathbf{A}={\mathbf{A}}_1{\mathbf{A}}_2\cdots {\mathbf{A}}_t$ ,则 $r\left(\mathbf{A}\right)\le \min \left\{r\left({\mathbf{A}}_1\right),r\left({\mathbf{A}}_2\right),\cdots ,r\left({\mathbf{A}}_t\right)\right\}$ .