The Homotopy Index and Partial Differential Equations

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The Homotopy Index and Partial Differential Equations
Krzysztof Rybakowski - The Homotopy Index and Partial Differential Equations
Published: 1987-10-05 | ISBN: 3540180672 | PDF | 208 pages | 6.64 MB

The homotopy index theory was developed by Charles Conley for two­ sided flows on compact spaces. The homotopy or Conley index, which provides an algebraic-topologi­ cal measure of an isolated invariant set, is defined to be the ho­ motopy type of the quotient space N /N , where is a certain 1 2 1 2 compact pair, called an index pair. Roughly speaking, N1 isolates the invariant set and N2 is the "exit ramp" of N . 1 It is shown that the index is independent of the choice of the in­ dex pair and is invariant under homotopic perturbations of the flow. Moreover, the homotopy index generalizes the Morse index of a nQnde­ generate critical point p with respect to a gradient flow on a com­ pact manifold. In fact if the Morse index of p is k, then the homo­ topy index of the invariant set {p} is Ik - the homotopy type of the pointed k-dimensional unit sphere.

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Tags: Homotopy, Partial, Differential, Equations

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