Abstract
On decrit une methode pour la reconstruction des X-arbres (arbres values admettant X comme ensemble de feuilles) a partir de tableaux de distances incomplets (ou certaines valeurs sont incertaines ou inconnues). Elle permet de construire un arbre non oriente a partir de 2n - 3 valeurs de distance entre les n elements de X, sous des conditions qui sont explicitees. Cette construction est basee sur une relation entre X-arbres et 2-arbres values generalises d'ensemble de sommets X.
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