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Tubular neighbourhoods for submersions of topological manifolds

Published online by Cambridge University Press:  17 April 2009

David B. Gauld
Affiliation:
Department of Mathematics, University of Auckland, Auckland, New Zealand.
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Abstract

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Let φ: M → N be a submersion from a metrizable manifold to any (topological) manifold, let BM be compact, y є N and C ⊂ φ−1(y) be a compact neighbourhood (in φ−1(y)) of B ∩ φ−1(y). It is proven that there is a neighbourhood U of y in N and an embedding ε: U × C → M such that φε is projection on the first factor, ε(y, x) = x for each x ε C, and B ∩ φ−1 (U) ⊂ ε(U×C). The main application given is to topological foliations, it being shown that if C is a compact regular leaf of a foliation F on M then every neighbourhood of C contains a saturated neighbourhood which is the union of compact regular leaves of F.

Type
Research Article
Copyright
Copyright © Australian Mathematical Society 1973

References

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