In this chapter we prove four important results which use the theory of G-complete reducibility and the geometric methods developed in the previous chapter. We focus on two related themes: understanding conjugacy classes of subgroups of G (or more generally conjugacy classes of homomorphisms into G) and understanding maps between quotients of the form \(G^n/\mkern -5mu/ G\) . The link to G-complete reducibility is Theorem 5.3.3 , since the points of the quotient variety \(G^n/\mkern -5mu/ G\) correspond to closed orbits in \(G^n\) , and these in turn correspond to conjugacy classes of G-cr subgroups of G.

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Finiteness, Rationality and Rigidity Results

  • Michael Bate,
  • Benjamin Martin,
  • Gerhard Röhrle

摘要

In this chapter we prove four important results which use the theory of G-complete reducibility and the geometric methods developed in the previous chapter. We focus on two related themes: understanding conjugacy classes of subgroups of G (or more generally conjugacy classes of homomorphisms into G) and understanding maps between quotients of the form \(G^n/\mkern -5mu/ G\) . The link to G-complete reducibility is Theorem 5.3.3 , since the points of the quotient variety \(G^n/\mkern -5mu/ G\) correspond to closed orbits in \(G^n\) , and these in turn correspond to conjugacy classes of G-cr subgroups of G.