Every symplectic manifold is a coadjoint orbit
May 4, 2015, update September 27, 2015
It is well known that, up to coverings, a connected Hausdorff symplectic manifold, homogeneous
Example of Singular Reduction...
November 1, 2014, update March 5, 2015
This is an example of symplectic reduction in diffeology where the spaces involved are infinite
Integration of closed forms in diffeology
December 31, 2013, update December 31, 2013
WORK IN PROGRESS. — I explore a geometrical representation of De Rham cohomology classes, for
The Space of Geodesics of a Lorentzian Manifold
September 28, 2013, update September 28, 2013
Here are two letters that I wrote to Serge Tabachnikov in May 2006, after we had a discussion on
Primary Spaces, Mackey’s Obstruction etc.
March 27, 2012, update November 8, 2013
Joint work  with Francois Ziegler.
We call a hamiltonian N-space primary if its moment map is onto
This is a list of articles I wrote, published or not (all of them are interesting ;-) And, each of them can be downloaded as pdf.
Look also at the archiveArchive.htmlshapeimage_8_link_0