Communications in Mathematical Physics

, Volume 118, Issue 2, pp 215–240 | Cite as

An instanton-invariant for 3-manifolds

  • Andreas Floer


To an oriented closed 3-dimensional manifoldM withH1(M, ℤ)=0, we assign a ℤ8-graded homology groupI*(M) whose Euler characteristic is twice Casson's invariant. The definition uses a construction on the space of instantons onM×ℝ.


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Copyright information

© Springer-Verlag 1988

Authors and Affiliations

  • Andreas Floer
    • 1
  1. 1.Courant InstituteNew YorkUSA

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