%0 Journal Article
%T A note on infinite extreme correlation matrices
%A J. Kiukas
%A J. -P. Pellonp£¿£¿
%J Mathematics
%D 2006
%I arXiv
%R 10.1016/j.laa.2007.12.001
%X We give a characterization for the extreme points of the convex set of correlation matrices with a countable index set. A Hermitian matrix is called a correlation matrix if it is positive semidefinite with unit diagonal entries. Using the characterization we show that there exist extreme points of any rank.
%U http://arxiv.org/abs/math/0612537v1