Can solvable extensions of a nilpotent subalgebra be useful in the classification of solvable algebras with the given nilradical?

Details Can solvable extensions of a nilpotent subalgebra be useful in the classification of solvable algebras with the given nilradical? Can solvable extensions of a nilpotent subalgebra be useful in the classification of solvable algebras with the given nilradical?

2009-08-03

arxiv.org/abs/0908.0271v1

Physics

Mathematical Physics

19 pages

Scientific paper

10.1016/j.laa.2009.11.035

We construct all solvable Lie algebras with a specific n-dimensional nilradical n_{n,3} which contains the previously studied filiform nilpotent algebra n_{n-2,1} as a subalgebra but not as an ideal. Rather surprisingly it turns out that the classification of such solvable algebras can be reduced to the classification of solvable algebras with the nilradical n_{n-2,1} together with one additional case. Also the sets of invariants of coadjoint representation of n_{n,3} and its solvable extensions are deduced from this reduction. In several cases they have polynomial bases, i.e. the invariants of the respective solvable algebra can be chosen to be Casimir invariants in its enveloping algebra.

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