The CS decomposition and conditional negative correlation inequalities for determinantal processes
For a conditional process of the form $(ϕ\vert A_{i} \not\subset ϕ)$ where $ϕ$ is a determinantal process we obtain a new negative correlation inequalities. Our approach relies upon the underlying geometric structure of the elementary discrete determinantal processes by using the canonical representation of a pair of subspaces in terms of principal vectors and angles, as well as the classical CS decomposition.