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This paper explains the fundamental relation between Jacobi structures and the classical Spencer operator coming from the theory of PDEs so as to provide a direct and geometric approach to the integrability of Jacobi structures. It uses…

Differential Geometry · Mathematics 2014-04-29 Marius Crainic , Maria Amelia Salazar

We study precontact groupoids whose infinitesimal counterparts are Dirac-Jacobi structures. These geometric objects generalize contact groupoids. We also explain the relationship between precontact groupoids and homogeneous presymplectic…

Differential Geometry · Mathematics 2009-11-11 David Iglesias Ponte , Aissa Wade

We use the supergeometric formalism, more precisely, the so-called "big bracket" (for which brackets and anchors are encoded by functions on some graded symplectic manifold) to address the theory of Jacobi algebroids and bialgebroids…

Differential Geometry · Mathematics 2010-12-14 Paulo dos Santos Antunes , Camille Laurent-Gengoux

We investigate the Jacobian decomposition of some algebraic curves over finite fields with genus $4$, $5$ and $10$. As a corollary, explicit equations for curves that are either maximal or minimal over the finite field with $p^2$ elements…

Algebraic Geometry · Mathematics 2019-12-10 Daniele Bartoli , Massimo Giulietti , Mokoto Kawakita , Maria Montanucci

We extend the formulae of classical invariant theory for the Jacobian of a genus one curve of degree $n \le 4$ to curves of arbitrary degree. To do this, we associate to each genus one normal curve of degree $n$, an $n \times n$ alternating…

Number Theory · Mathematics 2019-01-02 Tom Fisher

Consider the Jacobian of a hyperelliptic genus two curve defined over a prime field of characteristic p and with complex multiplication. In this paper we show that the p-Sylow subgroup of the Jacobian is either trivial or of order p.

Algebraic Geometry · Mathematics 2007-05-25 Christian Robenhagen Ravnshoj

We explicitly construct the algebraic model of affine Jacobian of a generic algebraic curve of high genus and use it to compute the Euler characteristic of the Jacobian and investigate its structure.

Mathematical Physics · Physics 2007-05-23 F. A. Smirnov , V. Zeitlin

Let $p$ be a prime, and $q$ a power of $p$. Using Galois theory, we show that over a field $K$ of characteristic zero, the endomorphism algebras of the jacobians of certain superelliptic curves $y^q=f(x)$ are products of cyclotomic fields.

Algebraic Geometry · Mathematics 2010-04-19 Jiangwei Xue

We classify meromorphic affine connections on compact complex surfaces with algebraic dimension one, extending the work of Inoue,Kobayashi and Ochiai (1981) in the holomorphic case. The motivation is to investigate possible extension of the…

Algebraic Geometry · Mathematics 2024-03-14 Alexis Garcia

We study meromorphic functions in a strip almost periodic with respect to the spherical metric. Then we get a complete description of zeros and poles for this class of functions, find a condition for a meromorphic almost periodic function…

Complex Variables · Mathematics 2007-05-23 S. Favorov , N. Parfyonova

We study the set of isomorphism classes of principal polarizations on abelian varieties of GL2-type. As applications of our results, we construct examples of curves C, C'/\Q of genus two which are nonisomorphic over \bar \Q and share…

Number Theory · Mathematics 2015-06-26 Josep Gonzalez , Jordi Guardia , Victor Rotger

We outline an approach to prove the two dimensional Jacobian Conjecture using the theory of fractals.

Algebraic Geometry · Mathematics 2015-10-20 Ronen Peretz

The class-invariant homomorphism allows one to measure the Galois module structure of extensions obtained by dividing points on abelian varieties. In this paper, we consider the case when the abelian variety is the Jacobian of a Fermat…

Number Theory · Mathematics 2017-05-04 Philippe Cassou-Noguès , Jean Gillibert , Arnaud Jehanne

We prove an unexpected general relation between the Jacobian syzygies of a projective hypersurface $V\subset \mathbb{P}^n$ with only isolated singularities and the nature of its singularities. This allows to establish a new method for the…

Algebraic Geometry · Mathematics 2025-05-21 Aline V. Andrade , Valentina Beorchia , Alexandru Dimca , Rosa M. Miró-Roig

We present an efficient endomorphism for the Jacobian of a curve $C$ of genus 2 (hyperelliptic) for divisors having a Non disjoint support. This extends the work of Costello and Lauter in [12] who calculated explicit formulae for divisor…

Algebraic Geometry · Mathematics 2014-05-23 Eduardo Ruiz Duarte , Octavio Páez Osuna

We describe an algorithm, based on the properties of the characteristic polynomials of Frobenius, to compute $\operatorname{End}_{\overline{K}}(A)$ when $A$ is the Jacobian of a nice genus-2 curve over a number field $K$. We use this…

Number Theory · Mathematics 2021-06-02 Davide Lombardo

Jacobi algebroids (i.e. `Jacobi versions' of Lie algebroids) are studied in the context of graded Jacobi brackets on graded commutative algebras. This unifies varios concepts of graded Lie structures in geometry and physics. A method of…

Differential Geometry · Mathematics 2008-11-26 Janusz Grabowski , Giuseppe Marmo

We give a method for finding rational equations of genus 2 curves whose jacobians are abelian varieties $A_f$ attached by Shimura to normalized newforms $f \in S_2( \Gamma_0(N))$. We present all the curves corresponding to principally…

Number Theory · Mathematics 2026-02-13 Enrique González-Jiménez , Josep González , Jordi Guàrdia

The Jacobian of a graph is a discrete analogue of the Jacobian of a Riemann surface. In this paper, we explore how Jacobians of graphs change when we glue two graphs along a common subgraph focusing on the case of cycle graphs. Then, we…

Combinatorics · Mathematics 2023-08-16 Alessandro Chilelli , Jaiung Jun

We give a structure theorem for the $m$-torsion of the Jacobian of a general superelliptic curve $y^m=F(x)$. We study existence of torsion on curves of the form $y^q=x^p-x+a$ over finite fields of characteristic $p$. We apply those results…

Algebraic Geometry · Mathematics 2021-06-10 Wojciech Wawrów
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