Self-dual Partial Differential Systems and Their Variational Principles
Autor: | Ghoussoub, Nassif |
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EAN: | 9781441927446 |
Sachgruppe: | Mathematik |
Sprache: | Englisch |
Seitenzahl: | 368 |
Produktart: | Kartoniert / Broschiert |
Veröffentlichungsdatum: | 19.11.2010 |
Schlagworte: | Differentialrechnung und -gleichungen Unternehmensanwendungen Wirtschaftsmathematik und -informatik, IT-Management differentialequation; functionalanalysis; partialdifferentialequation; Perturbation; perturbationtheory; PartialDifferentialEquations |
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How to solve partial differential systems by completing the square. This could well have been the title of this monograph as it grew into a project to develop a s- tematic approach for associating suitable nonnegative energy functionals to a large class of partial differential equations (PDEs) and evolutionary systems. The minima of these functionals are to be the solutions we seek, not because they are critical points (i. e. , from the corresponding Euler-Lagrange equations) but from also - ing zeros of these functionals. The approach can be traced back to Bogomolnyi¿s trick of ¿completing squares¿ in the basic equations of quantum eld theory (e. g. , Yang-Mills, Seiberg-Witten, Ginzburg-Landau, etc. ,), which allows for the deri- tion of the so-called self (or antiself) dual version of these equations. In reality, the ¿self-dual Lagrangians¿ we consider here were inspired by a variational - proach proposed ¿ over 30 years ago ¿ by Brezis ¿ and Ekeland for the heat equation and other gradient ows of convex energies. It is based on Fenchel-Legendre - ality and can be used on any convex functional ¿ not just quadratic ones ¿ making them applicable in a wide range of problems. In retrospect, we realized that the ¿- ergy identities¿ satis ed by Leray¿s solutions for the Navier-Stokes equations are also another manifestation of the concept of self-duality in the context of evolution equations.