A coarse MayerVietoris principle Academic Article uri icon


  • In [1], [4], and [6] the authors have studied index problems associated with the coarse geometry of a metric space, which typically might be a complete noncompact Riemannian manifold or a group equipped with a word metric. The second author has introduced a cohomology theory, coarse cohomology, which is functorial on the category of metric spaces and coarse maps, and which can be computed in many examples. Associated to such a metric space there is also a C*-algebra generated by locally compact operators with finite propagation. In this note we will show that for suitable decompositions of a metric space there are MayerVietoris sequences both in coarse cohomology and in the K-theory of the C*-algebra. As an application we shall calculate the K-theory of the C*-algebra associated to a metric cone. The result is consistent with the calculation of the coarse cohomology of the cone, and with a coarse version of the BaumConnes conjecture.

published proceedings

  • Mathematical Proceedings of the Cambridge Philosophical Society

author list (cited authors)

  • Higson, N., Roe, J., & Yu, G.

citation count

  • 47

complete list of authors

  • Higson, Nigel||Roe, John||Yu, Guoliang

publication date

  • July 1993