The corner relaxation of a mixed-integer linear program is a central concept in cutting plane theory. In a recent paper Fischetti and Monaci provide an empirical assessment of the strength of the corner and other related relaxations on benchmark problems. In this paper we give a precise characterization of the bounds given by these relaxations for the edge formulation of the maximum stable set problem in a graph.
Gérard Cornuéjols, Carla Michini, Giacomo Nannicini. How tight is the corner relaxation? Insights gained from the stable set problem, Discrete Optimization(2012), http://dx.doi.org/10.1016/j.disopt.2012.02.004.