A simplicial model for proper homotopy types

Details A simplicial model for proper homotopy types A simplicial model for proper homotopy types

2008-12-05

arxiv.org/abs/0812.1138v2

Mathematics

Algebraic Topology

9 pages; minor corrections and changes in notation

Scientific paper

The singular simplicial set Sing(X) of a space X completely captures its weak homotopy type. We introduce a category of_controlled sets_, yielding _simplicial controlled sets_, such that one can functorially produce a singular simplicial controlled set CSing(MaxCtl(X)) from a locally compact X. We then argue that this CSing(MaxCtl(X)) captures the (weak)_proper_ homotopy type of X. Moreover, our techniques strictly generalize the classical simplicial situation: e.g., one obtains, in a unified way, singular homology with compact supports and (Borel-Moore) singular homology with locally finite supports, as well as the corresponding cohomologies.

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