Une grosse partie des travaux de cette th`ese peuvent ˆetre r´e-interpr´et´es en termes de multicourbes sur des familles de sph`eres priv´ees d’un nombre fini de points qui se pincent lorsque des points ont mˆeme limite. Dans ce contexte, les arbres de sph`eres apparaissent de fa¸con tr`es naturelle. L’espace de Teichmuller peut ˆetre vu comme le revˆetement universel de l’espace des modules. Il y a donc un tr`es fort lien entre ce travail et celui de Nikita Selinger ([S]) ainsi que ceux de Sarah Koch et J.A. Hubbard ([Ko] et [HK]) et bien d’autres. De fa¸con plus g´en´erale, les accouplements de polynˆomes font apparaˆıtre naturellement des applications entre arbres de sph`eres. Par exemple Arnaud Ch´eritat donne un exemple de telles applications dans [Ch].
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