. La-distance-au-seuil-en-milieu-infiní-etant-fixée, On constate tout d'abord que la solution triviale bifurque quand le mode j = 1 se déstabilise longueur de cohérencè a la valeur de considérée Au voisinage du point (, ()) de l'espace des paramètres, on peut utiliser les techniques classiques de théorie de la bifurcation appliquéesappliquées`appliquéesà l'´ equation d'enveloppe. Réciproquement, ´ etant fixé et suppose très grand devant ? c pour que l'utilisation du formalisme d'enveloppe soit légitime, l'extension du domaine de validité de cette approche " facile " o` u le nombre de degrés de liberté effectifs reste petit diminue rapidement: j = O(1) implique ? ? 2 Hors de ce domaine, i.e. ?(), le point de départ approprié n'est plus le système confiné mais le milieu infini pour lequel on peut, comme plus hautéliminerhautéliminer tous les paramètres. La condition ?() se traduit alors par?=par? par?=

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