Sensitivity analysis for generalized linear-quadratic problems

In this paper, we study simple necessary and sufficient conditions for the stability of generalized linear-quadratic programs under perturbations of the data. The concept of generalized linear-quadratic problem was introduced by Rockafellar and Wets and consists of solving saddle points of a linear-quadratic convex concave functionJ onU×V, whereU andV are polyhedral convex sets in ⁿ and ^m. This paper also establishes results on the closedness and the uniform boundedness of the saddle-point solution sets. These properties are then used to obtain results on the continuity and the directional derivative of the perturbed saddle value.The research of the first author was supported by the CEE, Grant No. CI1-CT92-0046.