Las 27 rectas de una superficie cúbica.
Lieu singulier d'une surface réglée
Linear systems representing threefolds which are scrolls on a rational surface.
Linearly Normal Curves in P^n
2000 Mathematics Subject Classification: 14H45, 14H50, 14J26.We construct linearly normal curves covering a big range from P^n, n ≥ 6 (Theorems 1.7, 1.9). The problem of existence of such algebraic curves in P^3 has been solved in [4], and extended to P^4 and P^5 in [10]. In both these papers is used the idea appearing in [4] and consisting in adding hyperplane sections to the curves constructed in [6] (for P^3) and [15, 11] (for P^4 and P^5) on some special surfaces. In the present paper we apply...
Lines on del Pezzo surfaces with in characteristic 2 in the smooth case.