幂等的

This paper is a study on the invertibility of the commutator of scalar-idempotent elements and scalar-involutory elements of a unitary ring.

本文研究在一个有单位元环中两个倍幂等元换位子与两个倍对合元换位子性问题。

The necessary and sufficient conditions of similarity of two idempotent matrices are proved, the idempotency of linear combinations of two idempotent matrices is discussed.

摘要证明了域上两个同阶幂等充要条件是它们有同秩；给出了幂等标准型；讨论了两个幂等线性组合仍是幂等充要条件。