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March  2008, 7(2): 433-443. doi: 10.3934/cpaa.2008.7.433

Finding invariant tori with Poincare's map

1. 

Department of Mathematics, National Changhua University of Education, 1, Jin-De Rd, Changhua, 50007, Taiwan

Received  October 2006 Revised  February 2007 Published  December 2007

We consider the existence problem of invariant tori for quasi-periodic equation. We regard quasi-periodic functions with $n$ frequencies as periodic functions of functions with $n-1$ frequencies, which constitute a function space. Then we define Poincare's return map of a given semiflow on the space whose fixed point corresponds to an invariant torus of the semiflow.
Citation: Hsuan-Wen Su. Finding invariant tori with Poincare's map. Communications on Pure & Applied Analysis, 2008, 7 (2) : 433-443. doi: 10.3934/cpaa.2008.7.433
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