Mohamed Mahdi ed.,Mutations sociales et réorganisation des espaces steppiques
نویسندگان
چکیده
منابع مشابه
Groupes et Espaces Vectoriels
Définition 1.2. Un groupe (G,+) est dit abélien, si la loi + est commutative. Notation 1.1. Lorsque (G,+) est un groupe abélien, l’élément neutre est souvent noté 0G et l’inverse d’un élément x est noté −x. Exemple 1.1. Un ensemble à un élément, x, est un groupe abélien pour la loi + définie par x+ x ∆ = x. Preuve 1. + est associative. 2. + est commutative. 3. x est un élément neutre car pour t...
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ژورنال
عنوان ژورنال: Études rurales
سال: 2003
ISSN: 0014-2182,1777-537X
DOI: 10.4000/etudesrurales.8038