This article is respectfully dedicated to the memory of Wolfgang Yourgrau, philosopher and physicist. Wolfgang’s energy and interests were boundless. One of his fields of study was classical general relativity and, although he never worked directly on quantum gravity, he took a keen interest in developments in that area and discussed the subject with me at great length. Wolfgang frequently expressed the view that modern mathematics had much to give to physics and I hope for this reason that he would have approved of the contents of the present paper.


Vacuum State Cohomology Group Short Exact Sequence Homotopy Class Betti Number 
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Copyright information

© Plenum Press, New York 1983

Authors and Affiliations

  • C. J. Isham
    • 1
  1. 1.Blackett LaboratoryImperial College of Science and TechnologyLondonEngland

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