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                <term xml:lang="en"> client-server</term>
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                <term xml:lang="fr">valeur singulière minimale</term>
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                <term xml:lang="fr">dénombrement de valeurs propres</term>
                <term xml:lang="fr">Pseudospectre</term>
                <term xml:lang="fr"> trace</term>
                <term xml:lang="fr"> orbite</term>
                <term xml:lang="fr"> efficiency</term>
                <term xml:lang="fr"> Efficacité</term>
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              <p>L’article se consacre à la localisation de valeurs propres pour une grande matrice creuse, apriori non symétrique, dans un domaine du plan complexe. Il combine deux notions déjà étudiées. Lapremière précise l’effet de perturbations sur la matrice par la définition de e -spectre ou pseudospectre.La deuxième consiste à dénombrer les valeurs propres entourées par une courbe a priori donnéedans le plan complexe. A partir de travaux antérieurs, on combine ici les deux approches avec l’objectifde mettre en commun les factorisations LU de la résolvante nécessaire aux deux approches et d’endiminuer le nombre. Les codes obtenus sont parallélisés.</p>
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