A comment concerning cohomology and invariants of Lie algebras with respect to contractions and deformations
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چکیده
Contrary to the expected behavior, we show the existence of noninvertible deformations of Lie algebras which can generate invariants for the coadjoint representation, as well as delete cohomology with values in the trivial or adjoint module. A criterion to decide whether a given deformation is invertible or not is given in dependence of the Poincaré polynomial. PACS numbers: 02.20Sv, 02.20Qs, 98.80Jk A comment concerning cohomology and invariants of Lie algebras 2
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تاریخ انتشار 2006