1.The necessary and sufficient conditions of similarity of two idempotent matrices are proved, the idempotency of linear combinations of two idempotent matrices is discussed.
1.摘证明了数域上两个同阶幂等阵
充
条件
们有
同
秩;给出了幂等阵
标准型;讨论了两个幂等阵
线性组合仍
幂等阵
充
条件。