Critical angles between two convex cones

In this talk we present a general theory of critical angles for a pair of
closed convex cones via the optimization point of view. The angular
analysis for a pair of specially structured cones will be also discussed.
For instance, we work with linear subspaces, polyhedral cones,
revolution cones, topheavy cones and cones of matrices. This is a joint
work with Alberto Seeger.