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We characterize plane rational curves of degree four with two or more inner Galois points. A computer verifies the existence of plane rational curves of degree four with three inner Galois points. This would be the first example of a curve…

Algebraic Geometry · Mathematics 2015-11-10 Satoru Fukasawa

This paper studies the Galois action on a special lattice of geometric origin, which is related to mod-$\ell$ abelian-by-central quotients of geometric fundamental groups of varieties. As a consequence, we formulate and prove the mod-$\ell$…

Algebraic Geometry · Mathematics 2018-02-06 Adam Topaz

This paper considers some algebraic surfaces that can deform to planar Zappatic stable surfaces with a unique singularity of type En. We prove that the Galois covers of these surfaces are all simply connected of general type, for n >= 4,…

Algebraic Geometry · Mathematics 2024-04-08 Meirav Amram , Cheng Gong , JiaLi Mo

We introduce generalised orbit algebras. The purpose here is to measure how some combinatorial properties can characterize the action of a group of permutations on the subsets. The similarity with orbit algebras is such that it took the…

Combinatorics · Mathematics 2010-08-24 Xavier Buchwalder

We study the arithmetic of Galois-invariant sets of points on algebraic curves with controlled reduction behavior. Let $C$ be a smooth projective curve with a smooth proper model $\mathcal{C}$ over $\mathcal{O}_{K,S}$. We define $\Omega_n$…

Number Theory · Mathematics 2026-04-02 Fatemehzahra Janbazi , Fateme Sajadi

Let $L$ be a degree $2$ Galois extension of the field $K$ and $M$ an $n\times n$ matrix with coefficients in $L$. Let $\langle \ ,\ \rangle : L^n\times L^n\to L$ be the sesquilinear form associated to the involution $\sigma: L\to L$ fixing…

Commutative Algebra · Mathematics 2016-11-21 E. Ballico

A conjecture for higher order separation on generic rational surfaces with some new results about standard divisors.

Algebraic Geometry · Mathematics 2007-05-23 James Alexander

New cases of the multiplicity conjecture are considered.

Commutative Algebra · Mathematics 2007-05-23 Juergen Herzog , Xinxian Zheng

Recently, Marian-Oprea-Pandharipande established (a generalization of) Lehn's conjecture for Segre numbers associated to Hilbert schemes of points on surfaces. Extending work of Johnson, they provided a conjectural correspondence between…

Algebraic Geometry · Mathematics 2025-04-09 L. Göttsche , M. Kool

Let $f$ be a newform of weight $k\geq 2$, level $N$ with coefficients in a number field $K$, and $A$ the adjoint motive of the motive $M$ associated to $f$. We carefully discuss the construction of the realisations of $M$ and $A$, as well…

Number Theory · Mathematics 2025-12-15 Fred Diamond , Matthias Flach , Li Guo

We contribute to the Malle conjecture on the number N (K, G, y) of finite Galois extensions E of some number field K of finite group G and of discriminant of norm |N K/Q (d E)| $\le$ y. We prove the lower bound part of the conjecture for…

Number Theory · Mathematics 2019-01-01 François Motte

Let $S$ be a Shimura variety and let $h$ be a Weil height function on $S$. We conjecture that the heights of special points in $S$ are discriminant negligible. Assuming this conjecture to be true, we prove that the sizes of the Galois…

Number Theory · Mathematics 2021-09-30 Gal Binyamini , Harry Schmidt , Andrei Yafaev

We establish a set of general results to study how the Galois action on modular tensor categories interacts with fusion subcategories. This includes a characterization of fusion subcategories of modular tensor categories which are closed…

Quantum Algebra · Mathematics 2021-11-10 Julia Plavnik , Andrew Schopieray , Zhiqiang Yu , Qing Zhang

A theory of graded manifolds can be viewed as a generalization of differential geometry of smooth manifolds. It allows one to work with functions which locally depend not only on ordinary real variables, but also on $\mathbb{Z}$-graded…

Differential Geometry · Mathematics 2023-03-14 Jan Vysoky

Euler systems are certain compatible families of cohomology classes, which play a key role in studying the arithmetic of Galois representations. We briefly survey the known Euler systems, and recall a standard conjecture of Perrin-Riou…

Number Theory · Mathematics 2021-01-27 David Loeffler , Sarah Livia Zerbes

We propose an improved algorithm for computing mod $\ell$ Galois representations associated to a cusp form $f$ of level one. The proposed method allows us to explicitly compute the case with $\ell=29$ and $f$ of weight $k=16$, and the cases…

Number Theory · Mathematics 2014-08-05 Peng Tian

We introduce and study the notion of a generalised Hecke orbit in a Shimura variety. We define a height function on such an orbit and study its properties. We obtain a lower bounds for the size of Galois orbits of points in a generalised…

Number Theory · Mathematics 2023-07-18 Rodolphe Richard , Andrei Yafaev

In this work, applying general results from averaging theory, we find periodic orbits for a class of Hamiltonian systems $H$ whose potential models the motion of elliptic galaxies.

Classical Analysis and ODEs · Mathematics 2015-06-12 Felipe Alfaro , Jaume Llibre , Ernesto Pérez-Chavela

Gallai's path decomposition conjecture states that the edges of any connected graph on n vertices can be decomposed into at most (n+1)/2 paths. We confirm that conjecture for all graphs with maximum degree at most five.

Combinatorics · Mathematics 2016-09-21 Marthe Bonamy , Thomas Perrett

We prove the theorems which are equivalent to the Roland's results such that a new form of them allows to consider some generalizations. In particular, we give generators of primes more than a fixed prime.

Number Theory · Mathematics 2010-03-03 Vladimir Shevelev