Mathematical Notes

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

Invariants of CR-manifolds associated with the tangent quadric

  • V. K. Beloshapka


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.


Manifold Rational Mapping Description Problem Projective Invariant Cremona Group 
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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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