Lie groups and definability
- Post, Sacha Pierre Angel
- Alf Onshuus Director
Defence university: Universidad de los Andes (Colombia)
Year of defence: 2021
- John Richard Goodrick Chair
- Annalisa Conversano Chair
- Elías Baro González Chair
Type: Thesis
Abstract
It is known since 1988 (Pillay) that any group definable in an o-minimal expansion of the real field is a Lie group. In this work we give criteria for Lie groups to have a definable copy, that is to be isomorphic (as a Lie group) to a group definable in such expansions. More particularly, we show that under the criterions given by Conversano, Onshuus and Starchenko for the solvable case, the group is actually isomorphic to a matrix group definable using only the real exponential and the field structure. Morover we characterize completely those linear Lie grousp with definable copies. This characterization extends to the nonb linear case if the Lie group has Levi subgroup with finite center.