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的环中两幂等元的换位子与两合元的换位子的可逆性问题。

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

摘要证明了域上两同阶幂等阵相似的充要条件是有相同的秩；给出了幂等阵的相似标准型；讨论了两幂等阵的线性组合仍是幂等阵的充要条件。