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We describe the topology of singular real algebraic curves in a smooth surface. We enumerate and bound in terms of the degree the number of topological types of singular algebraic curves in the real projective plane.

Algebraic Geometry · Mathematics 2026-01-14 Christopher-Lloyd Simon

We use gauge theoretic and algebraic methods to examine sufficient conditions for smooth points on the moduli space of flat connections on a compact manifold and on the character variety of a finitely generated and presented group. We give…

Differential Geometry · Mathematics 2018-09-13 Nan-Kuo Ho , Graeme Wilkin , Siye Wu

Using log geometry, we study smoothability of genus zero twisted stable maps to stacky curves relative to a collection of marked points. One application is to smoothing semi-log canonical fibered surfaces with marked singular fibers.

Algebraic Geometry · Mathematics 2026-03-04 Kenneth Ascher , Dori Bejleri

We develop a global cohomology theory for number fields by offering topological cohomology groups, an arithmetical duality, a Riemann-Roch type theorem, and two types of vanishing theorem. As applications, we study moduli spaces of…

Algebraic Geometry · Mathematics 2011-02-24 Lin Weng

We state a conjecture relating de Rham cohomology of a smooth rigid analytic variety to its compactly supported pro-\'etale cohomology. We prove the conjecture in the cases where the variety is a Stein curve of dimension one or a Stein…

Algebraic Geometry · Mathematics 2025-11-21 Sally Gilles

Geometrical properties of holonomic and non holonomic varieties defined by the Pfaff equations connected with a first order systems of differential equations are studied. The Riemann extensions of affine connected spaces for investigation…

Differential Geometry · Mathematics 2007-05-23 Valerii Dryuma

The aim of these notes is to present an accessible overview of some topics in classical algebraic geometry which have applications to aspects of discrete integrable systems. Precisely, we focus on surface theory on the algebraic geometry…

Algebraic Geometry · Mathematics 2025-10-15 Gessica Alecci , Michele Graffeo , Alexander Stokes

We present a restricted version of some affine Jacobi's residue formula (on an affine algebraic variety) with applications to higher dimensional (and affine) analogues of Wood's (or Reiss's) relations about the interpolation of pieces of…

Complex Variables · Mathematics 2007-05-23 Carlos A. Berenstein , Alekos Vidras , Alain Yger

We show that compatible systems of $\ell$-adic sheaves on a scheme of finite type over the ring of integers of a local field are compatible along the boundary up to stratification. This extends a theorem of Deligne on curves over a finite…

Algebraic Geometry · Mathematics 2019-11-13 Qing Lu , Weizhe Zheng

We characterise the integral affine plane curves over a finite field $k$ with the property that all but finitely many of their $\overline{k}$-points have coordinates that are $j$-invariants of elliptic curves with isomorphic endomorphism…

Number Theory · Mathematics 2024-01-24 Francesco Campagna , Gabriel Andreas Dill

As a part of our program for Geometric Arithmetic, we develop an arithmetic cohomology theory for number fields using theory of locally compact groups.

Algebraic Geometry · Mathematics 2007-05-23 Lin Weng

We study hyperelliptic curves y^2=f(x) over local fields of odd residue characteristic. We introduce the notion of a "cluster picture" associated to the curve, that describes the p-adic distances between the roots of f(x), and show that…

Number Theory · Mathematics 2026-01-13 Tim Dokchitser , Vladimir Dokchitser , Céline Maistret , Adam Morgan

The geometry of algebraic curves over finite fields is a rich area of research. In previous work, the authors investigated a particular aspect of the geometry over finite fields of the classical unit circle, namely how the number of…

Number Theory · Mathematics 2018-03-01 Vagn Lundsgaard Hansen , Andreas Aabrandt

We construct and study universal spaces for birational invariants of algebraic varieties over algebraic closures of finite fields.

Algebraic Geometry · Mathematics 2014-08-05 Fedor Bogomolov , Yuri Tschinkel

We elucidate the geometric background of function-theoretic properties for the Gauss maps of several classes of immersed surfaces in three-dimensional space forms, for example, minimal surfaces in Euclidean three-space, improper affine…

Differential Geometry · Mathematics 2014-05-29 Yu Kawakami

Let $F$ be the function field of a curve over a non-archimedean local field. Let $m \geq 2$ be an integer coprime to the characteristic of the residue field of the local field. In this article, we show that every element in $H^{3}(F,…

Number Theory · Mathematics 2021-05-19 Saurabh Gosavi

In this paper, we give a necessary and sufficient condition for the finiteness of Galois cohomology of unipotent groups over local fields of positive characteristic

Number Theory · Mathematics 2011-08-31 Nguyen Duy Tan

The present paper is a continuation of our work on curved finitary spacetime sheaves of incidence algebras and treats the latter along Cech cohomological lines. In particular, we entertain the possibility of constructing a non-trivial de…

General Relativity and Quantum Cosmology · Physics 2007-05-23 A. Mallios , I. Raptis

This is a continuation of our previous work on the locally analytic vectors of the completed cohomology of modular curves. We construct differential operators on modular curves with infinite level at p in both "holomorphic" and…

Number Theory · Mathematics 2022-09-15 Lue Pan

We study toric varieties over a field k that split in a Galois extension K/k using Galois cohomology with coefficients in the toric automorphism group. Part of this Galois cohomology fits into an exact sequence induced by the presentation…

Algebraic Geometry · Mathematics 2013-05-28 E. Javier Elizondo , Paulo Lima-Filho , Frank Sottile , Zach Teitler