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

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

2000-02-10

arxiv.org/abs/math/0002077v1

Mathematics

Geometric Topology

35 pages, 7 figures, A newer version of this paper will appear in Topology

Scientific paper

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.

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