Surgery obstruction groups
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1 Introduction
The surgery obstruction groups of C.T.C. Wall [wall-book], [wall-VI] contain the obstructions to doing surgery on a degree 1 normal map to obtain a homotopy equivalence. In this setting, is an -dimensional Poincar\'e complex is the fundamental group of , and is the first Stiefel-Whitney class.
The groups depend on a coefficient ring , a discrete group and an orientation character . In general the surgery obstruction groups are abelian groups. For finite groups the -groups are finitely-generated and the only torsion is -primary.
A Guide to the Calculation of Surgery Obstruction Groups, Hambleton & Taylor (2000), pp. 1-3