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We say that a group is {\em almost abelian} if every commutator is central and squares to the identity. Now let $G$ be the Galois group of the algebraic closure of the field $\QQ$ of rational numbers in the field of complex numbers. Let…

Number Theory · Mathematics 2007-05-23 Greg W. Anderson

Let $\phi:\,X\rightarrow Y$ be a (possibly ramified) cover between two algebraic curves of positive genus. We develop tools that may identify the Prym variety of $\phi$, up to isogeny, as the Jacobian of a quotient curve $C$ in the Galois…

Algebraic Geometry · Mathematics 2020-03-18 Davide Lombardo , Elisa Lorenzo García , Christophe Ritzenthaler , Jeroen Sijsling

We prove the Bogomolov conjecture for an abelian variety A over a function field which is totally degenerate at a place v. We adapt Zhang's proof of the number field case replacing the complex analytic tools by tropical analytic geometry. A…

Number Theory · Mathematics 2009-11-11 Walter Gubler

Based on the reduction of degree in polynomial mappings and some known results in algebraic geometry, by introducing the Brouwer degree, a tool from differential topology, algebraic topology and algebraic geometry, we completely prove the…

Algebraic Geometry · Mathematics 2022-09-07 Quan Xu

We refine and generalize the results of K. E. Lauter and E. W. Howe on principal polarizations on products of abelian varieties over finite fields. Firstly, we study the reasons for the absence of an irreducible principal polarization in…

Algebraic Geometry · Mathematics 2025-02-21 Sergey Rybakov

This article contains a complete proof of Gabrielov's rank Theorem, a fundamental result in the study of analytic map germs. Inspired by the works of Gabrielov and Tougeron, we develop formal-geometric techniques which clarify the difficult…

Complex Variables · Mathematics 2021-06-30 André Belotto da Silva , Octave Curmi , Guillaume Rond

In this article one extends the classical theory of (intermediate) Jacobians to the "noncommutative world". Concretely, one constructs a Q-linear additive Jacobian functor J(-) from the category of noncommutative Chow motives to the…

Algebraic Geometry · Mathematics 2012-12-06 Matilde Marcolli , Goncalo Tabuada

We demonstrate that the 3-power torsion points of the Jacobians of the principal modular curves X(3^n) are fixed by the kernel of the canonical outer Galois representation of the pro-3 fundamental group of the projective line minus three…

Number Theory · Mathematics 2022-02-22 Matthew Papanikolas , Christopher Rasmussen

J.H. Koolen and J. Park have proved a lower bound for intersection number $c_2$ of a distance-regular graph $\Gamma$. Moreover, they showed that the graph $\Gamma$ which attains the equality in this bound is a Terwilliger graph. We prove…

Combinatorics · Mathematics 2010-07-21 Alexander Gavrilyuk

Let $\Gamma$ be a discrete group. Following Linnell and Schick one can define a continuous ring $c(\Gamma)$ associated with $\Gamma$. They proved that if the Atiyah Conjecture holds for a torsion-free group $\Gamma$, then $c(\Gamma)$ is a…

Rings and Algebras · Mathematics 2014-02-25 Gabor Elek

We construct a Baum--Connes assembly map localised at the unit element of a discrete group $\Gamma$. This morphism, called $\mu_\tau$, is defined in $KK$-theory with coefficients in $\mathbb{R}$ by means of the action of the projection…

Operator Algebras · Mathematics 2020-09-10 Paolo Antonini , Sara Azzali , Georges Skandalis

In this paper, it is shown that, for any equidimensional $C^\infty$ map-germ $f: (\mathbb{R}^n,0)\to (\mathbb{R}^n,0)$, the map-germ $F: (\mathbb{R}^n, 0) \to \mathbb{R}^n\times\mathbb{R}^{\ell}$ defined by $F(x)=\left(f(x),…

Classical Analysis and ODEs · Mathematics 2018-06-28 Takashi Nishimura

We consider the question of when a Jacobian of a curve of genus $2g$ admits a $(2,2)$-isogeny to two polarized dimension $g$ abelian varieties. We find that one of them must be a Jacobian itself and, if the associated curve is…

Algebraic Geometry · Mathematics 2025-09-17 Nils Bruin , Avinash Kulkarni

We introduce a certain integrability condition for the reciprocal of the Jacobian determinant which guarantees the local homeomorphism property of quasiregular mappings with a small inner dilatation. This condition turns out to be sharp in…

Complex Variables · Mathematics 2021-06-03 Ville Tengvall

The Local Converse Problem is to determine how the family of the local gamma factors $\gamma(s,\pi\times\tau,\psi)$ characterizes the isomorphism class of an irreducible admissible generic representation $\pi$ of $\mathrm{GL}_n(F)$, with…

Number Theory · Mathematics 2015-04-14 Dihua Jiang , Chufeng Nien , Shaun Stevens

In this paper we present a theorem concerning an equivalent statement of the Jacobian Conjecture in terms of Picard-Vessiot extensions. Our theorem completes the earlier work of T. Crespo and Z. Hajto which suggested an effective criterion…

Commutative Algebra · Mathematics 2015-06-05 Elzbieta Adamus , Pawel Bogdan , Zbigniew Hajto

In this paper, using the method of moving frames, we generalise some of Terracini's results on varieties with tangent defect. In particular, we characterise varieties with higher order osculating defect in terms of Jacobians of higher…

Algebraic Geometry · Mathematics 2014-06-13 Pietro De Poi , Roberta Di Gennaro , Giovanna Ilardi

We prove a Freiman--Ruzsa-type theorem with polynomial bounds in arbitrary abelian groups with bounded torsion, thereby proving (in full generality) a conjecture of Marton. Specifically, let $G$ be an abelian group of torsion $m$ (meaning…

Number Theory · Mathematics 2024-05-22 W. T. Gowers , Ben Green , Freddie Manners , Terence Tao

We prove that vector-valued Siegel cusp forms for $\Gamma_0^n(N)$ with certain nebentypus are determined by their fundamental Fourier coefficients with discriminants coprime to the level $N$, assuming $N$ is odd and square-free. In the case…

Number Theory · Mathematics 2025-08-15 Sidney Washburn

The said paper [2] entitled "Proof Of Two Dimensional Jacobian Conjecture" is with gaps.

Rings and Algebras · Mathematics 2007-05-23 T. T. Moh
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