Publication: A comment concerning cohomology and invariants of Lie algebras with respect to contractions and deformations
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Publication Date
2007
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Elsevier
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Abstract
Contrary to the expected behavior, we show the existence of non-invertible 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.
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