Dn中幂等元的一种关系

摘要

This paper investigates some properties of idempotent matrices in Dn. We give another equivalence description of idempotent matrices and a necessary and sufficient condition that the product of two idempotent matrices is still idempotent.%本文研究了Dn中幂等元的某些性质,给出了幂等元的另一个等价刻划以及两幂等元之积仍是幂等元的一个充要条件.