%0 Journal Article
%A Campoamor Stursberg, Otto-Rudwig
%T A comment concerning cohomology and invariants of Lie algebras with respect to contractions and deformations
%D 2007
%@ 0375-9601
%U https://hdl.handle.net/20.500.14352/50673
%X 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.
%~