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Let K be an algebraically closed valued field, and let f:X--->Y be auniversally open morphism of K-schemes of finite type. We show that the inducedmap on K-rational points is open for the topologies deduced from the absolutevalue of K.    Soit K un corps valu\'e alg\'ebriquement clos, et soit f:X--->Y un morphismeuniversellement ouvert de K-sch\'emas de type fini. On montre que l'applicationde X(K) dans Y(K) induite par f est ouverte pour les topologies d\'eduites dela valeur absolue sur K.

Un th\'eor\`eme de l'application ouverte sur les corps valu\'es alg\'ebriquement clos