Friday, 9:50 - 10:40 - Room 161

*Stream: Plenary*

Chair:

- On stability and sensitivity of constraint and variational systems

In post-optimal analysis and in the treatment of the so-called equilibrium constraints one often needs to analyze local stability of the solution maps which assign some parameters (e.g. problem data) the respective solutions (optima or equilibria). One of the most important local stability notions is the Aubin (Lipschitz-like) property which ensures that the perturbed problems (i) do possess a solution, and (ii) the distance of this solution from the original (reference) solution is bounded above by a multiple of the norm of the perturbation. In the lecture, a new non-restrictive suffcient condition for the Aubin property will be presented in the general framework of implicitly defined multifunctions. In this development our main tool are generalized derivatives and coderivatives which provide a convenient description of the local behavior of nonsmooth and set-valued mappings. In particular, it is the directional limiting coderivative due to H. Gfrerer, which is tailored to fine local analysis of multifunctions along specified directions. This new condition will then be specialized to constraint and variational systems having a frequently arising structure, which requires a development of a certain calculus for the directional limiting coderivatives. We will present one rule of this new calculus generalizing a formula due to Dontchev and Rockafellar. The advantages of this new approach will be illustrated by examples. The lecture is based on a joint work with Helmut Gfrerer (Johannes Kepler Universitaet Linz).

Short biography

Jiri V. Outrata is Senior Researcher in the Institute of Information Theory and Automation of the Czech Academy of Sciences. In the period 1991-2001 he spent several years in Germany on leave with the University of Bayreuth and the University of Erlangen-Nuremberg. His technical background is optimal control but, since 1993 his main attention is devoted to mathematical programs with equilibrium constraints. In 2007 Jiri Outrata was awarded the Honorary Medal of Bernard Bolzano and since 2013 he is Adjunct Professor of the Federation University in Ballarat, Australia.