On morphisms onto quadrics

نویسندگان

چکیده

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Mapping threefolds onto three-quadrics

We prove that the degree of a nonconstant morphism from a smooth projective 3-fold X with Néron-Severi group Z to a smooth 3-dimensional quadric is bounded in terms of numerical invariants of X. In the special case where X is a 3-dimensional cubic we show that there are no such morphisms. The main tool in the proof is Miyaoka’s bound on the number of double points of a surface.

متن کامل

Harmonic morphisms onto Riemann surfaces and generalized analytic functions

© Annales de l’institut Fourier, 1987, tous droits réservés. L’accès aux archives de la revue « Annales de l’institut Fourier » (http://annalif.ujf-grenoble.fr/) implique l’accord avec les conditions générales d’utilisation (http://www.numdam.org/legal.php). Toute utilisation commerciale ou impression systématique est constitutive d’une infraction pénale. Toute copie ou impression de ce fichier...

متن کامل

On morphisms of crossed polymodules

‎In this paper‎, ‎we prove that the category of crossed polymodules (i.e‎. ‎crossed modules of polygroups) and their morphisms is finitely complete‎. ‎We‎, ‎therefore‎, ‎generalize the group theoretical case of this completeness property of crossed modules‎.

متن کامل

On Arcs and Quadrics

An arc is a set of points of the (k − 1)-dimensional projective space over the finite field with q elements Fq, in which every k-subset spans the space. In this article, we firstly review Glynn’s construction of large arcs which are contained in the intersection of quadrics. Then, for q odd, we construct a series of matrices Fn, where n is a non-negative integer and n 6 |G| − k− 1, which depend...

متن کامل

Diophantine approximation on rational quadrics

We compute the Hausdorff dimension of sets of very well approximable vectors on rational quadrics. We use ubiquitous systems and the geometry of locally symmetric spaces. As a byproduct we obtain the Hausdorff dimension of the set of rays with a fixed maximal singular direction, which move away into one end of a locally symmetric space at linear depth, infinitely many times.

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ژورنال

عنوان ژورنال: Mathematical Notes

سال: 2007

ISSN: 0001-4346,1573-8876

DOI: 10.1134/s0001434607030327