Integral Structures on H-type Lie Algebras

Details Integral Structures on H-type Lie Algebras Integral Structures on H-type Lie Algebras

2001-01-28

arxiv.org/abs/math/0101230v1

Mathematics

Differential Geometry

13 pages, LaTeX

Scientific paper

In this paper we prove that every H-type Lie algebra possesses a basis with respect to which the structure constants are integers. Existence of such an integral basis implies via the Mal'cev criterion that all simply connected H-type Lie groups contain cocompact lattices. Since the Campbell-Hausdorff formula is very simple for two-step nilpotent Lie groups we can actually avoid invoking the Mal'cev criterion and exhibit our lattices in an explicit way. As an application, we calculate the isoperimetric dimensions of H-type groups.

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