2 papers
math.AT2005
Homotopy pull-back squares up to localization
W. Chacholski, W. Pitsch, J. Scherer
We characterize the class of homotopy pull-back squares by means of elementary closure properties. The so called Puppe theorem which identifies the homotopy fiber of certain maps c…
math.AT2004
Homotopy invariance of higher signatures and 3-manifold groups
Michel Matthey, Hervé Oyono-Oyono, Wolfgang Pitsch
For closed oriented manifolds, we establish oriented homotopy invariance of higher signatures that come from the fundamental group of a large class of orientable 3-manifolds, inclu…