2 papers
math.GT2008
Stably diffeomorphic manifolds and l_{2q+1}(Z[π])
Diarmuid Crowley, Jörg Sixt
The monoids l_{2q+1}(Z[π]) detect s-cobordisms amongst certain bordisms between stably diffeomorphic 2q-dimensional manifolds and generalise the Wall simple surgery obstruction gro…
math.AT2004
The algebraic theory of Kreck surgery
Jörg Sixt
In the 1980s Matthias Kreck developed a modified surgery theory with obstructions in a hardly understood monoid . This paper presents a couple of purely algebraic tools…