实幂等矩阵的几个等价条件

Several Equivalent Conditions of Real Idempotent Matrix

给出并证明了实幂等矩阵的九个等价条件 ,以及实对称幂等矩阵的一个等价条件。

Nine equivalent conditions of real idempotent matrix are given and proved,and one equivalent condition of real symmetric idempotent matrix is also given in this paper.