Mathematics – Geometric Topology
Scientific paper
2003-10-20
"Whitney towers and Gropes in 4--manifolds", Trans. Amer. Math. Soc. 358 (2006), 4251-4278
Mathematics
Geometric Topology
Now closely approximates published version. Some references added
Scientific paper
Many open problems and important theorems in low-dimensional topology have been formulated as statements about certain 2--complexes called gropes. This paper describes a precise correspondence between embedded gropes in 4--manifolds and the failure of the Whitney move in terms of iterated `towers' of Whitney disks. The `flexibility' of these Whitney towers is used to demonstrate some geometric consequences for knot and link concordance connected to n-solvability, k-cobordism and grope concordance. The key observation is that the essential structure of gropes and Whitney towers can be described by embedded unitrivalent trees which can be controlled during surgeries and Whitney moves.
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