All two dimensional links are null homotopic

Details All two dimensional links are null homotopic All two dimensional links are null homotopic

2000-04-05

arxiv.org/abs/math/0004021v2

Geom. Topol. 3 (1999), 235-252

Mathematics

Geometric Topology

18 pages. Published copy, also available at http://www.maths.warwick.ac.uk/gt/GTVol3/paper10.abs.html

Scientific paper

We show that any number of disjointly embedded 2-spheres in 4-space can be
pulled apart by a link homotopy, ie, by a motion in which the 2-spheres stay
disjoint but are allowed to self-intersect.

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