Transverse LS category for Riemannian foliations

Hurder, Steven; Töben, Dirk

doi:10.1090/s0002-9947-09-04672-8

Cited by 5 publications

(2 citation statements)

References 59 publications

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“…Example 2.8. Every codimension 1 singular Riemannian foliation in the sense of Molino (see, for instance, the last chapter of his book [15]; see also [10] for more on the subject) is Bott-Morse with only center-type components. This includes the foliations defined by cohomogeneity 1 isometric actions of Lie groups on smooth manifolds with special orbits.…”

Section: Examplesmentioning

confidence: 99%

Codimension 1 foliations with Bott-Morse singularities II

Scárdua

Seade

2011

Journal of Topology

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We study codimension 1 foliations with singularities defined locally by Bott‐Morse functions on closed oriented manifolds. We extend to this setting the classical concepts of holonomy of invariant sets and stability, and prove a stability theorem in the spirit of the local stability theorem of Reeb. This yields, among other things, a good topological understanding of the leaves one may have about a center‐type component of the singular set, and also of the topology of its basin. The stability theorem further permits one to determine the topology of the boundary of the basin and how the topology of the leaves changes when passing from inside to outside the basin. This is described via ‘fiberwise Milnor‐Wallace surgery’. A key‐point in this respect is to show that if the boundary of the basin of a center is non‐empty, then it contains a saddle; in this case we say that the center and the saddle are paired. We then describe the possible pairings one may have in dimension three and use a construction motivated by the classical saddle‐node bifurcation, which we call foliated surgery, that allows for the reduction of certain pairings of singularities of a foliation. This is used together with our previous work on the topic to prove an extension for 3‐manifolds of Reeb's sphere recognition theorem.

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Section: Examplesmentioning

confidence: 99%

Codimension 1 foliations with Bott-Morse singularities II

Scárdua

Seade

2011

Journal of Topology

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“…Example 2.8. Every codimension 1 singular Riemannian foliation in the sense of P. Molino (see for instance the last chapter of his book [15]; see also [10] for more on the subject), is Bott-Morse with only center-type components. This includes the foliations defined by cohomogeneity 1 isometric actions of Lie groups on smooth manifolds with special orbits.…”

Section: Examplesmentioning

confidence: 99%

Codimension one foliations with Bott-Morse singularities I

Scáardua¹,

Seade²

2009

J. Differential Geom.

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We study codimension one foliations with singularities defined locally by Bott-Morse functions on closed oriented manifolds. We carry to this setting the classical concepts of holonomy of invariant sets and stability, and prove a stability theorem in the spirit of the local stability theorem of Reeb. This yields, among other things, a good topological understanding of the leaves one may have around a center-type component of the singular set, and also of the topology of its basin. The stability theorem further allows the description of the topology of the boundary of the basin and how the topology of the leaves changes when passing from inside to outside the basin. This is described via fiberwise Milnor-Wallace surgery. A keypoint for this is to show that if the boundary of the basin of a center is non-empty, then it contains a saddle; in this case we say that the center and the saddle are paired. We then describe the possible pairings one may have in dimension three and use a construction motivated by the classical saddle-node bifurcation, that we call foliated surgery, that allows the reduction of certain pairings of singularities of a foliation. This is used together with our previous work on the topic to prove an extension for 3-manifolds of Reeb's sphere recognition theorem. ContentsSubject Classification: Primary 57R30, 58E05; Secondary 57R70, 57R45.

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