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Mathematical Notes

, Volume 59, Issue 1, pp 31–38 | Cite as

Invariants of CR-manifolds associated with the tangent quadric

  • V. K. Beloshapka
Article

Abstract

We construct a system of CR-invariants of a manifold generated by projective invariants of the tangent quadric. We present a description of the group of projective diffeomorphisms of a quartic. We also estimate the degree of a rational mapping of a quartic. The description problem for subgroups of a Cremona group of bounded degree is posed.

Keywords

Manifold Rational Mapping Description Problem Projective Invariant Cremona Group 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Publishing Corporation 1996

Authors and Affiliations

  • V. K. Beloshapka
    • 1
  1. 1.Moscow State UniversityUSSR

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