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.

本文研究在一有单位元环倍幂等元换位子与倍对合元换位子可逆性问题。

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

摘要证明了域上同阶幂等阵充要条件是它们有同秩；给出了幂等阵标准型；讨论了幂等阵线性组合仍是幂等阵充要条件。