设M是n阶实对称矩阵， 如果对任一非零实向量X，都使二次型f(X)= X^TMX>0，则称f(X)为正定二次型，f(X)对应的矩阵M称为正定矩阵(Positive Definite)。
正定矩阵 [数] positive definite matrix ; Definite matrix ; Are certain matrix
半正定矩阵 [数] positive semidefinite matrix
对称正定矩阵 symmetrical positive determined matrix ; Symmetric positive matrix
广义正定矩阵 Generalized positive matrix
检验矩阵的正定性 IsDefinite
次正定矩阵 [数] positive subdefinite matrix ; meta-positive definite matrix
关于D的广义正定矩阵 gengealixed positive definite for
实正定矩阵 Real positive definite matrix
复正定矩阵 complex positive definite matrix
定义了正规矩阵，并给出了判断正规矩阵正定的若干方法。
This paper gives the definition regular matrix and offers several methods for deciding the regular matrix definite.
然而，目前国内外有关协方差矩阵正定性的研究结果并不多，并且大多是集中在连续型样本协方差矩阵方面。
However, there have been few outcomes about the positive definitiveness of covariance matrix, most of which have been restricted to the Covariance-matrix of continuous sample.
结果得到了当m是广义正定矩阵时，线性互补问题存在唯一解。
Results linear complementary problem have unique solution when m is generalized positive definite matrix.
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