%0 Journal Article
%T Euler class and free generation
%A Alexander Reznikov
%J Mathematics
%D 1997
%I arXiv
%X the main theorem gives a sufficient condition for a n elements of SL(2,R) to generate a free group.The idea behind it is to use a nonorientable version of the Dehn-Wolpert-Goldman twist and to sew it with the original representation of a free group to get representation of the closed surfase group and then to apply Goldman' theorem.
%U http://arxiv.org/abs/dg-ga/9709009v1