For , the correlation function of a point process associated with the eigenvalues is
The factorial factor counts ordered selections of distinct eigenvalues, so this is a factorial moment density, rather than the ordinary probability density of particular labels. Equivalently, for a nonnegative measurable test function ,
Repeated projection kernel determinant integration, with , gives a factor on integrating an -by- kernel determinant down to size . Together with the normalizing in , the factors cancel:
In particular and . Set and for . The eigenvalue configuration is thus a determinantal point process with a rank- finite-rank projection kernel.
The correlation functions of a point process use factorial normalization:
Start with . By Gaudin's lemma, integrating once gives , and integrating once gives . The factorial factors cancel, so the eigenvalues form a determinantal point process with
and
The last equality uses the real symmetry of this kernel. In particular, and , as required for three points and six ordered pairs of distinct points.