Mathematics – Geometric Topology
Scientific paper
2005-05-18
Mathematics
Geometric Topology
To appear in proceedings of the Fields Institute/McMaster Conference on Geometry and Topology of Manifolds
Scientific paper
We give a survey of geometric approaches to the topological 4-dimensional surgery and 5-dimensional s-cobordism conjectures, with a focus on the study of surfaces in 4-manifolds. The geometric lemma underlying these conjectures is a statement about smooth immersions of disks and of certain 2-complexes, capped gropes, in a 4-manifold. We also mention a reformulation in terms of the A,B-slice problem, and the relation of this question to recent developments in the study of the classical knot concordance group.
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