A generalization of Vassiliev's h-principle

Details A generalization of Vassiliev's h-principle A generalization of Vassiliev's h-principle

2007-05-02

arxiv.org/abs/0705.0333v1

Mathematics

Algebraic Topology

91 pages; PhD thesis, University of Aberdeen, 2006

Scientific paper

This thesis consists of two parts which share only a slight overlap. The first part is concerned with the study of ideals in the ring $C^\infty(M,R)$ of smooth functions on a compact smooth manifold M or more generally submodules of a finitely generated $C^\infty(M,R)$-module V. We define a topology on the space of all submodules of V of a fixed finite codimension d. Its main property is that it is compact Hausdorff and, in the case of ideals in the ring itself, it contains as a subspace the configuration space of d distinct unordered points in M and therefore gives a "compactification" of this configuration space. We present a concrete description of this space for low codimensions. The main focus is then put on the second part which is concerned with a generalization of Vassiliev's h-principle. This principle in its simplest form asserts that the jet prolongation map $j^r:C^\infty(M,E)\to\Gamma(J^r(M,E))$, defined on the space of smooth maps from a compact manifold M to a Euclidean space E and with target the space of smooth sections of the jet bundle $J^r(M,E)$, is a cohomology isomorphism when restricted to certain "nonsingular" subsets (these are defined in terms of a certain subset $R\subseteq J^r(M,E)$). Our generalization then puts this theorem in a more general setting of topological $C^\infty(M,R)$-modules. As a reward we get a strengthening of this result asserting that all the homotopy fibres have zero homology.

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