800 conics on a smooth quartic surface

نویسندگان

چکیده

We construct an example of a smooth spatial quartic surface that contains 800 irreducible conics.

برای دانلود رایگان 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

Smooth quartic surfaces with 352 conics

Up to now the maximal number of smooth conics, that can lie on a smooth quartic surface, seems not to be known. So our number 352 should be compared with 64, the maximal number of lines that can lie on a smooth quartic [S]. We construct the surfaces as Kummer surfaces of abelian surfaces with a polarization of type (1, 9). Using Saint-Donat’s technique [D] we show that they embed in IP3. In thi...

متن کامل

On the Number of Smooth Conics Tangent to Five Fixed Conics

In section 1, we define the abelian groups Ak(X) in a manner analagous to the homology groups Hk(X) by considering cycles of subvarieties modulo rational equivalence. In section 2, we construct, for any Cartier divisor D on X and subvariety V ⊂ X, an intersection class D · [V ] ∈ Ak−1(|D|∩|V |) and state its basic properties. Bezout’s theorem follows easily. In section 3, we discuss the centerp...

متن کامل

Manin’s conjecture on a nonsingular quartic del Pezzo surface

Given a nonsingular quartic del Pezzo surface, Manin's conjecture predicts the density of rational points on the open subset of the surface formed by deleting the lines. We prove that this prediction is of the correct order of magnitude for a particular surface.

متن کامل

A Quartic Surface of Integer Hexahedra

We prove that there are infinitely many sixsided polyhedra in R3, each with four congruent trapezoidal faces and two congruent rectangular faces, so that the faces have integer sides and diagonals, and also the solid has integer length diagonals. The solutions are obtained from the integer points on a particular quartic surface. A long standing unsolved problem asks whether or not there can be ...

متن کامل

On a Theorem of Intersecting Conics

Given two conics over an infinite field that intersect at the origin, a line through the origin will, in general intersect both conic sections once more each, at points C and D. As the line varies we find that the midpoint of C and D traces out a curve, which is typically a quartic. Intuitively, this locus is the “average” of the two conics from the perspective of an observer at the origin. We ...

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: Journal of Pure and Applied Algebra

سال: 2022

ISSN: ['1873-1376', '0022-4049']

DOI: https://doi.org/10.1016/j.jpaa.2022.107077