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                <term xml:lang="fr">groupes d'extensions</term>
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                <term xml:lang="fr">catégories de foncteurs</term>
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              <p>We show that extension groups between two polynomial functors on free groups are the same in the category of all functors and in a subcategory of polynomial functors of bounded degree. We give some applications.</p>
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              <p>On montre que les groupes d'extensions entre foncteurs polynomiaux sur les groupes libres sont les mêmes dans la catégorie de tous les foncteurs et dans une sous-catégorie de foncteurs polynomiaux de degré borné. On donne quelques applications.</p>
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