准次正定矩阵

The almost positive subdefinite matrix

提出了准次正定矩阵的概念 ,研究了它及其 Hadamard积与 Kronecker积的基本性质 ,将对称正定阵的 Schur定理、华罗庚定理、Openheim不等式拓广到了准次正定阵上 。

The concept of almost positive subdefinite matrix is given, the basic property that it and its Hadamard product and Kronecker product has been discussed.The symmetric positive definite matrix of Schurs theorem , Hua Luogeng's theorem and Openheims inequality are extended to almost positive subdefinite matrix, and various kind positive subdefinite matrix to have unified.