通过指数算符的分解，给出了SU（1，1）李代数玻色指数算符的正规和反正规乘积。
By using decomposition of exponential operators, the normal and antinormal ordering product of Boson exponential operators for SU(1,1) Lie algebra are given.
利用正规矩阵和乘积可交换矩阵的重要性质 ，给出了亚正定矩阵的三个充分条件以及其合同矩阵的两个分解形式 。
And the classical Courant-Fisher theorem is applied to the complex normal matrix by using a kind of decomposition of complex normal matrices.
利用正规矩阵和乘积可交换矩阵的重要性质 ，给出了亚正定矩阵的三个充分条件以及其合同矩阵的两个分解形式 。
And the classical Courant-Fisher theorem is applied to the complex normal matrix by using a kind of decomposition of complex normal matrices.
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