The algebraic theory of Kreck surgery
Jörg Sixt
Abstract
In the 1980s Matthias Kreck developed a modified surgery theory with obstructions in a hardly understood monoid ln(Z[π]). This paper presents a couple of purely algebraic tools to find out whether an element in l2q(R) is "elementary" i.e. whether a Kreck surgery problem leads to an h-cobordism or not.
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