The definitiveness and stability of laws lie in the relative stability of the value judgement criteria in form and in essence.

法律的确定性和稳定性在于该种价值判断标准在形式上和实质上的相对稳定性。

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.

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。