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A comment concerning cohomology and invariants of Lie algebras with respect to contractions and deformations

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2007

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Elsevier
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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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