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Paper IPM / M / 16531  


Abstract:  
The action on the space C^4 of the 7dimensional Lie group of infinitesimal holomorphic automorphisms of a completely nondegenerate cubic model surface Q of CRtype (1,3) is considered. All orbits of the given action are found and their biholomorphic classification is given. One of the orbits
coincides with the surface Q (the 5dimensional orbit), two orbits are 6dimensional, and the remaining
part of the space C^4, the complement to the above orbits, foliates into 7dimensional real orbits. It is also proved that the algebra of infinitesimal holomorphic automorphisms of all orbits, except for the twelve holomorphically degenerate orbits, coincides with the algebra of the surface Q.
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