For example four moments and four linear combinations under general conditions (specified later) determine the distribution of n = 56 independent random variables, but not of 57.

I know to find if a set of vectors are linearly indepenent I have to put them in a matrix and get the rref. if the rref == the identity matrix, then the vectors are linearl independent. but why ...

With no restriction on covariance matrices, we also provide a solution of the best linear combination of markers in the sense that the area under the ROC curve of this combination is maximized among ...