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Mathematics > Geometric Topology

arXiv:math/0002077 (math)
[Submitted on 10 Feb 2000]

Title:Differential 3-knots in 5-space with and without self intersections

Authors:Tobias Ekholm
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Abstract: Regular homotopy classes of immersions of a 3-sphere in 5-space constitute an infinite cyclic group. The classes containing embeddings form a subgroup of index 24. The obstruction for a generic immersion to be regularly homotopic to an embedding is described in terms of geometric invariants of its self intersection. Geometric properties of self intersections are used to construct two invariants J and St of generic immersions which are analogous to Arnold's invariants of plane curves. We prove that J and St are independent first order invariants and that any first order invariant is a linear combination of these.
As by-products, some invariants of immersions of 3-spheres in 4-space are obtained. Using them, we find restrictions on the topology of self intersections.
Comments: 35 pages, 7 figures, A newer version of this paper will appear in Topology
Subjects: Geometric Topology (math.GT)
MSC classes: 57R42; 57R45
Cite as: arXiv:math/0002077 [math.GT]
  (or arXiv:math/0002077v1 [math.GT] for this version)
  https://doi.org/10.48550/arXiv.math/0002077

Submission history

From: Tobias Ekholm [view email]
[v1] Thu, 10 Feb 2000 21:34:51 UTC (38 KB)
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