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Smooth real cubic surfaces are birationally trivial (over $\R$) if and only if their real locus is connected or, equivalently, if and only if they have two skew real lines or two skew complex conjugate lines. In such a case a…

Algebraic Geometry · Mathematics 2010-10-05 Jon Gonzalez-Sanchez , Irene Polo-Blanco

A fast algorithm for counting intersections of two normal curves on a triangulated surface is proposed. It yields a convenient way for treating mapping class groups of punctured surfaces by presenting mapping classes by matrices, and the…

Geometric Topology · Mathematics 2021-10-12 Ivan Dynnikov

We give an algorithm to compute the zeta function of the Fano surface of lines of a smooth cubic threefold $F$ into $\mathbb{P}^4$ defined over a finite field. We obtain some examples of Fano surfaces with supersingular reduction.

Algebraic Geometry · Mathematics 2015-03-17 Xavier Roulleau

In this paper, with the help of trinomial coefficients we study some arithmetic properties of certain determiants involving reciprocals of binary quadratic forms over finite fields.

Number Theory · Mathematics 2024-07-25 Yue-Feng She , Hai-Liang Wu

We classify smooth projective surfaces that are quotients of abelian surfaces by finite groups.

Algebraic Geometry · Mathematics 2023-08-08 Takahiro Shibata

For any power $q$ of the positive ground field characteristic, a smooth $q$-bic threefold -- the Fermat threefold of degree $q+1$ for example -- has a smooth surface $S$ of lines which behaves like the Fano surface of a smooth cubic…

Algebraic Geometry · Mathematics 2026-03-10 Raymond Cheng

We study pencils of hypersurfaces over finite fields $\mathbb{F}_q$ such that each of the $q+1$ members defined over $\mathbb{F}_q$ is smooth.

Algebraic Geometry · Mathematics 2022-03-15 Shamil Asgarli , Dragos Ghioca

We investigate the distribution of rational points on singular cubic surfaces, whose coordinates have few prime factors. The key tools used are universal torsors, the circle method and results on linear equations in primes.

Number Theory · Mathematics 2023-10-31 Yuchao Wang , Weili Yao

We study the set of common $\mathbb{F}_q$-rational solutions of "smooth" systems of multivariate symmetric polynomials with coefficients in a finite field $\mathbb{F}_q$. We show that, under certain conditions, the set of common solutions…

Algebraic Geometry · Mathematics 2023-12-18 Nardo Giménez , Guillermo Matera , Mariana Pérez , Melina Privitelli

Let $\mathbb{F}_q$ denote the finite field with $q$ elements. In this work, we use characters to give the number of rational points on suitable curves of low degree over $\mathbb{F}_q$ in terms of the number of rational points on elliptic…

Number Theory · Mathematics 2020-01-31 José Alves Oliveira

This paper focuses on greedy expansions, one possible representation of numbers, and on arithmetical operations with them. Performing addition or multiplication some additional digits can appear. We study bounds on the number of such digits…

Number Theory · Mathematics 2022-12-16 Magdaléna Tinková

We study lines on smooth cubic surfaces over the field of $p$-adic numbers, from a theoretical and computational point of view. Segre showed that the possible counts of such lines are $0,1,2,3,5,7,9,15$ or $27$. We show that each of these…

Algebraic Geometry · Mathematics 2023-09-25 Rida Ait El Manssour , Yassine El Maazouz , Enis Kaya , Kemal Rose

We explicitly calculate an arithmetic adelic quotient group for a locally free sheaf on an arithmetic surface when the fiber over the infinite point of the base is taken into account. The calculations are presented via a short exact…

Algebraic Geometry · Mathematics 2019-01-01 D. V. Osipov

Fano surfaces parametrize the lines of smooth cubic threefolds. In this paper, we study their quotients by some of their automorphism sub-groups. We obtain in that way some interesting surfaces of general type.

Algebraic Geometry · Mathematics 2012-02-10 Xavier Roulleau

In previous work, the authors introduced "soft" methods to prove the effective (i.e. with power savings error) equidistribution of "shears" in cusped hyperbolic surfaces. In this paper, we study the same problem but now allow full use of…

Number Theory · Mathematics 2018-02-27 Dubi Kelmer , Alex Kontorovich

In this note, we study linear determinantal representations of smooth plane cubics over finite fields. We give an explicit formula of linear determinantal representations corresponding to rational points. Using Schoof's formula, we count…

Algebraic Geometry · Mathematics 2016-04-22 Yasuhiro Ishitsuka

In this paper we investigate the distribution of the set of values of a linear map at integer points on a quadratic surface. In particular, it is shown that subject to certain algebraic conditions, this set is equidistributed. This can be…

Number Theory · Mathematics 2016-01-20 Oliver Sargent

In this paper we provide, first, a general symbolic algorithm for computing the symmetries of a given rational surface, based on the classical differential invariants of surfaces, i.e. Gauss curvature and mean curvature. In practice, the…

Computational Geometry · Computer Science 2024-10-25 Juan Juan Gerardo Alcázar , Carlos Hermoso , Hüsnü Anıl Çoban , Uğur Gözütok

For a given conic bundle X over a curve C defined over F_q, we count irreducible branch covers of C in X of degree d and height e>>1. As a special case, we get the number of algebraic numbers of degree d and height e over the function field…

Number Theory · Mathematics 2008-09-08 Seyfi Turkelli

In this paper we give a complete characterization of the intersections between the Norm-Trace curve over $\mathbb{F}_{q^3}$ and the curves of the form $y=ax^3+bx^2+cx+d$, generalizing a previous result by Bonini and Sala, providing more…

Algebraic Geometry · Mathematics 2022-07-05 Matteo Bonini , Massimiliano Sala , Lara Vicino