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Abstract.
The Wall surgery obstruction groups have two interesting geometrically defined subgroups, consisting of the surgery obstructions between closed manifolds, and the inertial elements.
We show that the inertia group 
and the closed manifold subgroup 
are equal in dimensions 
, for any finitely-presented group 
and any orientation character 
. This answers a question raised in 1980.
Received: 2009-10-26
Published Online: 2012-09-01
Published in Print: 2012-09-01
© 2012 by Walter de Gruyter Berlin Boston
