# American Institute of Mathematical Sciences

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January  2008, 21(1): 187-220. doi: 10.3934/dcds.2008.21.187

## Superposition of selfdual functionals in non-homogeneous boundary value problems and differential systems

 1 Department of Mathematics, The University of British Columbia, Vancouver BC Canada V6T 1Z2

Received  March 2007 Published  February 2008

Selfdual variational theory -- developed in [8] and [9] -- allows for the superposition of appropriate "boundary" Lagrangians with "interior" Lagrangians, leading to a variational formulation and resolution of problems with various linear and nonlinear boundary constraints that are not amenable to standard Euler-Lagrange theory. The superposition of several selfdual Lagrangians is also possible in many natural settings, leading to a variational resolution of certain differential systems. These results are applied to nonlinear transport equations with prescribed exit values, Lagrangian intersections of convex-concave Hamiltonian systems, initial-value problems of dissipative systems, as well as evolution equations with periodic and anti-periodic solutions.
Citation: Nassif Ghoussoub. Superposition of selfdual functionals in non-homogeneous boundary value problems and differential systems. Discrete & Continuous Dynamical Systems - A, 2008, 21 (1) : 187-220. doi: 10.3934/dcds.2008.21.187
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