Preface * Stabilization for the Wave Equation on Exterior Domains / L. Aloui and M. Khenissi * Carleman Estimate and Decay Rate of the Local Energy for the Neumann Problem of Elasticity System / Bellassoued * Microlocal Effect Measures for Systems / N. Burq * Strong Uniqueness for Laplace and bi-Laplace Operators in Limit Case / F. Colombini and C. Grammatico * Stabilization for the Semilinear Wave Equation in Bounded Domain / B. Dehman * Recent Results on Unique Continuation for Second Order Elliptic Equations / H. Koch and D. Tataru * Strong Uniqueness for Fourth Order Elliptic Differential Operators / P. Le Borgne * Second Microlocalization Methods for Degenerate Cauchy--Riemann Equations / N. Lerner * A Gårding Inequality on a Manifold with Boundary / N. Lerner and X. Saint Raymond * Some Necessary Conditions for Hyperbolic Systems / T. Nishitani * Strong Unique Continuation Property for First Order Elliptic Systems / T. Okaji * Observability of Schrödinger Equation / K.D. Phung * Unique Continuation from Sets of Positive Measure / R. Regbaoui * Some Results and Open Problems on the Controllability of Linear and Semilinear Heat Equations / E. Zuazua
The articles in this volume reflect a subsequent development after a scientific meeting entitled Carleman Estimates and Control Theory, held in Cartona in September 1999. The 14 research-level articles, written by experts, focus on new results on Carleman estimates and their applications to uniqueness and controlla bility of partial differential equations and systems. The main topics are unique continuation for elliptic PDEs and systems, con trol theory and inverse problems. New results on strong uniqueness for second or higher order operators are explored in detail in several papers. In the area of control theory. the reader will find applications of Carleman estimates to stabiliza tion, observability and exact control for the wave and the SchrOdinger equations. A final paper presents a challenging list of open problems on the topic of control lability of linear and sernilinear heat equations. The papers contain exhaustive and essentially self-contained proofs directly ac cessible to mathematicians, physicists, and graduate students with an elementary background in PDEs. Contributors are L. Aloui, M. Bellassoued, N. Burq, F. Colombini, B. Dehman, C. Grammatico, M. Khenissi, H. Koch, P. Le Borgne, N. Lerner, T. Nishitani. T. Okaji, K.D. Phung, R. Regbaoui, X. Saint Raymond, D. Tataru, and E. Zuazua.
Consists of expository articles and research papers highlighting new results on Carleman estimates and their applications. Focus is on unique continuation, control theory, and inverse problems. New results on strong uniqueness for second or higher order operators are explored in detail. Also examined are applications of Carleman estimates to stabilization, observability, and exact control for the wave and the Schrodinger equations. Includes open problems on the controllability of linear and semilinear heat equations. Of interest to researchers and graduate students of pdes and their applications.