The Italian school of Mathematical Analysis has long and glo rious traditions. In the last thirty years it owes very much to the scientific pre-eminence of Ennio De Giorgi, Professor of Mathemati cal Analysis at the Scuola Normale Superiore di Pisa. His fundamental theorems in Calculus of Variations, in Minimal Surfaces Theory, in Partial Differential Equations, in Axiomatic Set Theory as well as the fertility of his mind to discover both general mathematical structures and techniques which frame many different problems, and profound and meaningful examples which show the limits of a theory and give origin to new results and theories, makes him an absolute reference point for all Italian mathematicians, and a well-known and valued personage in the international mathematical world. We have been students of Ennio de Giorgi. Now, we are glad to present to him, together with all his collegues, friends and former students, these Essays of Mathematical Analysis written in his hon our on the occasion of his sixtieth birthday (February 8th, 1988), with our best wishes and our thanks for all he gave in the past and will give us in the future. We have added to the research papers of this book the text of a conversation with Ennio De Giorgi about the diffusion and the communication of science and, in particular, of Mathematics.

Partial Differential Equations and the Calculus of Variations: Essays in Honor of Ennio De Giorgi Volume 1 (Progress in Nonlinear Differential Equations and Their Applications)

Science & Math

MARINO

MODICA

SPAGNOLA

COLOMBINI, Ferruccio

Mathematics

Birkhauser

These volumes, dedicated to the great Italian mathematician Ennio De Giorgi on the occasion of his sixtieth birthday, present a series of essays by an international group of leading mathematicians. De Giorgi is well known for his fundamental results on the regularity of solutions of elliptic partial differential equations, minimal surfaces, and the asymptotic analysis of variational problems. These essays give an overview of recent developments in mathematical analysis, particularly in partial differential equations and the calculus of variations, which clearly shows the influence of De Giorgi's work.     The collection is completed with an interview with Ennio De Giorgi himself about the role of mathematics in the sciences and in society.      Volume I   Table of Contents    Preface  A Conversation with Ennio de Giorgi  An improvement of Cartan's test for ordinarity  A mathematical contribution to Gibb's analysis of fluid phases in equilibrium  The epi-continuation method for minimization problems. Relation with the degree theory of F. Browder for maximal monotone operators  Discretization of evolution variational inequalities  Homogenization for non-linear elliptic equations with random highly oscillatory coefficients  L infinity and L 1 variations on a theme of 'Gamma'-convergence  Asymptotics for elliptic equations involving critical growth   Asymptotic behaviour for Dirichlet problems in domains bounded by thin layers  Fundamental interior estimates for a class of second order elliptic operators  'Gamma'-Convergence of integral functionals defined on vector-valued functions  Limits of obstacle problems for the area functional  Some remarks on the well-posedness of the Cauchy problem in Gevrey spaces  Approximating measures and rectifiable curves  A non-uniqueness result for the operators with principal part\partial 2 t + a \partial 2 x   A note on duality and the calculus of variations  Some results on periodic solutions of Hamilton-Jacobi equations in Hilbert spaces  Generalized solutions to ordinary differential equations with discontinuous right-hand sides via 'Gamma'-convergence  Stationary solutions of nonlinear Schrödinger equations with an external magnetic field  On the touching principle  Generalized solutions and convex duality in optimal control  Models of self-descriptive set theories        Volume II   Table of Contents    On a class of nonlinear diagonal elliptic systems with critical growth and C1 'alpha' -regularity  Higher integrability from reverse Jensen inequalities with different supports  Partial regularity of cartesian currents which minimize certain variational integrals  Théorème des minimax locaux et fonctions topologiquement fermées  Variational principles with linear growth  Estimation de l'erreur dans des problèmes de Dirichlet oû apparaît un terme étrange  On atypical variational problems  Sur la contrôlabilité exacte élargie  Low and high frequency vibration in stiff problems  A time-discretization scheme approximating the non-linear evolution equation u t + ABu = 0  The stored-energy for some discontinuous deformations in nonlinear elasticity  The calculus of variations and some semilinear variational inequalities of elliptic and parabolic type  Some remarks on the dependence domain for weakly hyperbolic equations with constant multiplicity  Monotonicity of the energy for entire solutions of semilinear elliptic equations  Pseudo-differential operators of Volterra type on spaces of ultra-distributions and parabolic mixed problems  The Neumann problem for second order elliptic equations with rapidly oscillating periodic coefficients in a perforated domain  Discrete exterior measures and their meaning in applications  An embedding theorem  Nonlocal effects induced by homogenization  On regularity and existence of viscosity solutions of nonlinear second order, elliptic equations  Etude d'un système en multiplicité 4 , lorsque, le degrée du polinôme minimal est petit  On the Weierstrass integrals of the calculus of variations over BV varieties: recent results of the mathematical seminar in Perugia  Variable structures control of semilinear evolution equations

Partial Differential Equations and the Calculus of Variations: Essays in Honor of Ennio De Giorgi Volume 2 (Progress in Nonlinear Differential Equations and Their Applications)

COLOMBINI

Partial Differential Equations and the Calculus of Variations: Essays in Honor of Ennio De Giorgi (Progress in Nonlinear Differential Equations and Their Applications, 1)

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