By using an invariant related to free Lie algebras, we give a criterion of non existence of isomorphism for the Pfaffian systems.
@article{urn:eudml:doc:44392,
title = {Alg\`ebres de Lie libres associ\'ees a un syst\`eme de Pfaff.},
journal = {Revista Matem\'atica de la Universidad Complutense de Madrid},
volume = {13},
year = {2000},
pages = {183-192},
zbl = {1017.58002},
mrnumber = {MR1794909},
language = {fr},
url = {http://dml.mathdoc.fr/item/urn:eudml:doc:44392}
}
Ouazzani, Amina. Algèbres de Lie libres associées a un système de Pfaff.. Revista Matemática de la Universidad Complutense de Madrid, Tome 13 (2000) pp. 183-192. http://gdmltest.u-ga.fr/item/urn:eudml:doc:44392/