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In this article, we prove that a general version of Alladi's formula with Dirichlet convolution holds for arithmetical semigroups satisfying Axiom $A$ or Axiom $A^{\#}$. As applications, we apply our main results to certain semigroups…

Number Theory · Mathematics 2022-02-17 Lian Duan , Ning Ma , Shaoyun Yi

Due to a theorem by Orlov every exact fully faithful functor between the bounded derived categories of coherent sheaves on smooth projective varieties is of Fourier-Mukai type. We extend this result to the case of bounded derived categories…

Algebraic Geometry · Mathematics 2007-05-23 Alberto Canonaco , Paolo Stellari

A theorem by Orlov states that any equivalence between the bounded derived categories of coherent sheaves of two smooth projective varieties, X and Y, is isomorphic to a Fourier-Mukai transform with kernel in the bounded derived category of…

Algebraic Geometry · Mathematics 2012-10-05 Alice Rizzardo

The method for approximation of planar curve by circular arcs with length preservation, proposed by I.Kh. Sabitov and A.V. Slovesnov, is analyzed. We extend the applicability of the method, and consider some corollaries, not related to the…

Differential Geometry · Mathematics 2017-08-29 Alexey Kurnosenko

We develop a theory of diophantine approximation on generalized flag varieties, varieties that can be obtained as a quotient of a semisimple algebraic group by a parabolic subgroup. Using methods from the theory of arithmetic groups, due in…

Number Theory · Mathematics 2021-07-27 Nicolas de Saxcé

We show how ideas from \cite{2Blocki} and \cite{3Blocki} to prove the Suita conjecture can be adapted to give a proof of the Ohsawa-Takegoshi extension theorem with sharp estimates.

Complex Variables · Mathematics 2014-07-21 Bo Berndtsson , László Lempert

Let g be an integer greater than 1. A uniform version of the Parshin-Arakelov theorem on the finiteness of the set of non-isotrivial curves of genus g over a function field, with fixed degeneracy locus, is proved. This is applied to obtain…

Algebraic Geometry · Mathematics 2007-05-23 Lucia Caporaso

Fujita's second theorem for K\"ahler fibre spaces over a curve asserts that the direct image $V$ of the relative dualizing sheaf splits as the direct sum $ V = A \oplus Q$, where $A$ is ample and $Q$ is unitary flat. We focus on our…

Algebraic Geometry · Mathematics 2016-05-11 Fabrizio Catanese , Michael Dettweiler

We settle the conjecture posed by Sziklai on the number of points of a plane curve over a finite field under the assumption that the curve is nonsingular.

Algebraic Geometry · Mathematics 2014-01-21 Masaaki Homma , Seon Jeong Kim

We prove a formula (analogous to that of Kida in classical Iwasawa theory and generalizing that of Hachimori-Matsuno for elliptic curves) giving the analytic and algebraic p-adic Iwasawa invariants of a modular eigenform over an abelian…

Number Theory · Mathematics 2007-05-23 Robert Pollack , Tom Weston

In this note we apply a substantial improvement of a result of S. Ferenczi on $S$-adic subshifts to give Bratteli-Vershik representations of these subshifts.

Dynamical Systems · Mathematics 2012-10-05 Fabien Durand , Julien Leroy

We survey results on Hedetniemi's conjecture which are connected to adjoint functors in the "thin" category of graphs, and expose the obstacles to extending these results.

Combinatorics · Mathematics 2016-08-10 Jan Foniok , Claude Tardif

On a given arithmetic surface, inspired by work of Miyaoka, we consider vector bundles which are extensions of a line bundle by another one. We give sufficient conditions for their restriction to the generic fiber to be semi-stable. We then…

Algebraic Geometry · Mathematics 2007-05-23 C. Soule

In this article, we study an analytic curve $\varphi: I=[a,b]\rightarrow \mathrm{M}(n\times n, \mathbb{R})$ in the space of $n$ by $n$ real matrices, and show that if $\varphi$ satisfies certain geometric conditions, then for almost every…

Dynamical Systems · Mathematics 2015-11-10 Lei Yang

Following the work of Waldschmidt, we investigate problems in Diophantine approximation on abelian varieties. First we show that a conjecture of Waldschmidt for a given simple abelian variety is equivalent to a well-known Diophantine…

Number Theory · Mathematics 2025-06-25 Lior Fishman , David Lambert , Keith Merrill , David Simmons

We prove that rationally connected varieties over the function field of a complex curve satisfy weak approximation for places of good reduction.

Algebraic Geometry · Mathematics 2009-11-10 Brendan Hassett , Yuri Tschinkel

I show that every rectifiable simple closed curve in the plane can be continuously deformed into a convex curve in a motion which preserves arc length and does not decrease the Euclidean distance between any pair of points on the curve.…

Differential Geometry · Mathematics 2011-11-22 John Pardon

Wu, Zhang and Li [4] conjectured that the set of vertices of any simple graph $G$ can be equitably partitioned into $\lceil(\Delta(G)+1)/2\rceil$ subsets so that each of them induces a forest of $G$. In this note, we prove this conjecture…

Combinatorics · Mathematics 2012-11-22 Xin Zhang , Jian-Liang Wu

We establish an adelic version of Dirichlet's approximation theorem on spheres. Let $K$ be a number field, $E$ be a rigid adelic space over $K$ and $q\colon E\to K$ be a quadratic form. Let $v$ be a place of $K$ and $\alpha\in…

Number Theory · Mathematics 2024-09-25 Éric Gaudron

For any (possibly singular) hyperelliptic curve, we give the definition of a hyperelliptic refined spectral curve and the hyperelliptic refined topological recursion, generalising the formulation for a special class of genus-zero curves by…

Mathematical Physics · Physics 2024-11-28 Kento Osuga