Graded nilpotent Lie algebras of infinite type

Details Graded nilpotent Lie algebras of infinite type Graded nilpotent Lie algebras of infinite type

2010-01-03

arxiv.org/abs/1001.0379v1

Mathematics

Differential Geometry

18 pages

Scientific paper

The paper gives the complete characterization of all graded nilpotent Lie algebras with infinite-dimensional Tanaka prolongation as extensions of graded nilpotent Lie algebras of lower dimension by means of a commutative ideal. We introduce a notion of weak characteristics of a vector distribution and prove that if a bracket-generating distribution of constant type does not have non-zero complex weak characteristics, then its symmetry algebra is necessarily finite-dimensional. The paper also contains a number of illustrative algebraic and geometric examples including the proof that any metabelian Lie algebra with a 2-dimensional center always has an infinite-dimensional Tanaka prolongation.

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