
We present recent developments in the theory of quasi-periodic solutions to nonlinear PDEs, such as the nonlinear Schrodinger and the nonlinear Klein-Gordon equations. These solutions hold in arbitrary dimensions, and the quasi-periodicity can be either in time or space. The method hinges on multi-scale analysis, harmonic analysis and algebraic analysis.
35M20, Newton iteration, quasi-periodic solutions, semi-algebraic geometry, 42A16
35M20, Newton iteration, quasi-periodic solutions, semi-algebraic geometry, 42A16
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