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math.CV1998
Canonical isomorphism of two Lie algebras arising in CR-geometry
V. V. Ezhov, A. V. Isaev
We show that the maximal prolongation of a certain algebra associated with a non-degenerate Hermitian form on with values in is canonicall…
math.CV1998
Invariants of elliptic and hyperbolic CR-structures of codimension 2
V. V. Ezhov, A. V. Isaev, G. Schmalz
We reduce CR-structures on smooth elliptic and hyperbolic manifolds of CR-codimension 2 to parallelisms thus solving the problem of global equivalence for such manifolds. The paral…