relations d'ordre :
https://docs.google.com/viewer?a=v&pid= ... Mzk1&hl=es
telecharger :
https://doc-0o-bs-docs.googleuserconten ... e=download
relations d'équivalence :
https://docs.google.com/viewer?a=v&pid= ... Yjc4&hl=es
telecharger :
https://doc-0s-bs-docs.googleuserconten ... e=download