bokomslag An Extension of Casson's Invariant
Vetenskap & teknik

An Extension of Casson's Invariant

Kevin Walker

Pocket

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  • 150 sidor
  • 1992
This book describes an invariant, l, of oriented rational homology 3-spheres which is a generalization of work of Andrew Casson in the integer homology sphere case. Let R(X) denote the space of conjugacy classes of representations of p(X) into SU(2). Let (W,W,F) be a Heegaard splitting of a rational homology sphere M. Then l(M) is declared to be an appropriately defined intersection number of R(W) and R(W) inside R(F). The definition of this intersection number is a delicate task, as the spaces involved have singularities. A formula describing how l transforms under Dehn surgery is proved. The formula involves Alexander polynomials and Dedekind sums, and can be used to give a rather elementary proof of the existence of l. It is also shown that when M is a Z-homology sphere, l(M) determines the Rochlin invariant of M.
  • Författare: Kevin Walker
  • Format: Pocket/Paperback
  • ISBN: 9780691025322
  • Språk: Engelska
  • Antal sidor: 150
  • Utgivningsdatum: 1992-03-01
  • Förlag: Princeton University Press