In Ehresmann’s Footsteps: from Group Geometries to Groupoid Geometries

@inproceedings{Pradines2008InEF,
  title={In Ehresmann’s Footsteps: from Group Geometries to Groupoid Geometries},
  author={J R Pradines},
  year={2008}
}
The geometric understanding of Cartan connections led Charles Ehresmann from the Erlangen program of (abstract) transformation groups to the enlarged program of Lie groupoid actions, via the basic concept of structural groupoid acting through the fibres of a (smooth) principal fibre bundle or of its associated bundles, and the basic examples stemming from… CONTINUE READING