translate English to French: This document was generated using the LaTeX2HTML translator Version 200 2-1 (1.68), © 1993, 1994, 1995, 1996, Nikos Drakos , Computer Based Learning Unit, University of Leeds, © 1997, 1998, 1999, Ross Moore , Mathematics Department, Macquarie University, Sydney.
Document traduit de sa version anglaise par S. Merkel, Dept of Earth and Panet. Sc., Univ.