A generalization of Vassiliev's h-principle
msra(2007)
摘要
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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关键词
differential geometry,euclidean space,configuration space
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