幂等

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元环中两个倍幂等元子与两个倍对合元子可逆性问题。

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

摘要证明数域上两个同阶幂等阵相要条件是它们有相同秩；给出幂等阵相标准型；讨论两个幂等阵线性组合仍是幂等阵要条件。