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Unformatted text preview: Normal Forms Theory CDS140B Lecturer: Wang Sang Koon Winter, 2004 1 Normal Form Theory Introduction. To find a coordinate system where the dynamical system take the simplest form. The method is local in the sense that the coordinate transforms are generated near a know solution, such as a fixed point. The coordinate transformation will be nonlinear, but these transformation are found by solv ing a sequence of linear problem. The structure of the normal form is determined entirely by the nature of the linear part of the problem. Preliminary Preparation. Consider w = G ( w ) where w R n , G is C r , and the system has a fixed point at w = w . Then it can be written as (*) x = Jx + F ( x ) = Jx + F 2 ( x ) + F 3 ( x ) + + F r 1 ( x ) + O (  x  r ) where F i ( x ) represent the order i terms in the Taylor expansion of F ( x ). 1 1.1 Simplification of the Second Order Terms Introduce the coordinate transformation x = y + h 2 ( y ) where h 2 ( y ) is second order in...
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This note was uploaded on 01/04/2012 for the course CDS 140b taught by Professor List during the Fall '10 term at Caltech.
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