K-homology and index theory on contact manifolds

Paul F. Baum, Erik van Erp

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


This paper applies K-homology to solve the index problem for a class of hypoelliptic (but not elliptic) operators on contact manifolds. K-homology is the dual theory to K-theory. We explicitly calculate the K-cycle (i.e., the element in geometric K-homology) determined by any hypoelliptic Fredholm operator in the Heisenberg calculus.

The index theorem of this paper precisely indicates how the analytic versus geometric K-homology setting provides an effective framework for extending formulas of Atiyah–Singer type to non-elliptic Fredholm operators.

Original languageEnglish (US)
Pages (from-to)1-48
Number of pages48
JournalActa Mathematica
Issue number1
StatePublished - Sep 1 2014

All Science Journal Classification (ASJC) codes

  • Mathematics(all)


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