of an n-component field (or order parameter} for n&4. Simple proofs of known results are given.
Among new results, we shou that when it exists the stable fixed point is unique; we give some precision
on its symmetry and on its attractor basin.]]> theory with strictly locaI, non-polynomial, interacting Lagrangian
:A(x)r: 2e(x) = )__, t,-----
r=O r!
so as to preserve locality at every order. ]]> L'utilisation du théorème de réciprocité de Frobenius simplifie l'étude de la décomposition de la représentation de vibration de Gk en somme directe de représentations irréductibles.]]>