Access to the data-processing resources, in " self-service ", placed at the disposal by the Unit of Mathematics Pure and Applied Higher Teacher training school of Lyon PERSONAL ENGAGEMENT I took good note that the access to average data processing in " self-service " of the UMPA with the ENS of Lyon is granted to me on a purely personal basis , and within the limit of a use in direct relationship to my official presence within the unit. I commit myself to observe the legal conditions of use of the software and respecting the rights and duties of the users, exposed in the Charter for the use of the data-processing resources of the ENS of Lyon (consultable document to the library). The use of these resources is worth acceptance of this document.