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Sur les variétés X N telles que par n points passe une courbe de X de degré donné

Luc Pirio, Jean-Marie Trépreau (2013)

Bulletin de la Société Mathématique de France

Soit r 1 , n 2 , et q n - 1 des entiers. On introduit la classe 𝒳 r + 1 , n ( q ) des sous-variétés X de dimension r + 1 d’un espace projectif, telles que pour ( x 1 , ... , x n ) X n générique, il existe une courbe rationnelle normale de degré q , contenue dans X et passant par les points x 1 , ... , x n  ; X engendre un espace projectif dont la dimension, pour r , n et q donnés, est la plus grande possible compte tenu de la première propriété. Sous l’hypothèse q 2 n - 3 , on détermine toutes les variétés X appartenant à la classe 𝒳 r + 1 , n ( q ) . On montre en particulier qu’il existe une...

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