The validity of Freedman's disk theorem is known to depend only on the fundamental group. It was conjectured that it fails for nonabelian free fundamental groups. If this were true then surgery theory would work in dimension four. Recently, Krushkal and Lee proved a surprising result that surgery theory works for a large special class of 4-manifolds with free nonabelian fundamental groups. The goal of this paper is to show that this also holds for other fundamental groups which are not known to be good, and that it is best understood using controlled surgery theory of Pedersen-Quinn-Ranicki. We consider some examples of 4-manifolds which have the fundamental group either of a closed aspherical surface or of a 3-dimensional knot space. A more general theorem is stated in the appendix.
|Titolo:||Applications of controlled surgery in dimension 4: Examples|
HEGENBARTH, FRIEDRICH (Primo)
|Parole Chiave:||generalized manifold; ANR; Poincare duality; epsilon-delta-surgery; controlled Poincare complex; Quinn index; disk theorem; knot group; spine|
|Settore Scientifico Disciplinare:||Settore MAT/03 - Geometria|
|Data di pubblicazione:||2006|
|Appare nelle tipologie:||01 - Articolo su periodico|