  This paper is about non-Euclidean analysis on Lie groups endowed with left
invariant distributions, seen as sub-Riemannian manifolds.
  This is a an updated version, which will be modified according to the
contributions of the other participants to the Borel Seminar. The current
version can be downloaded at http://irmi.epfl.ch/cag/buliga_sr.html . All
comments are welcomed.
