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In this paper a new intrinsic geometric characterization of the symmetric square of a curve and of the ordinary product of two curves is given. More precisely it is shown that the existence on a surface of general type S of irregularity q…

Algebraic Geometry · Mathematics 2011-03-11 Margarida Mendes Lopes , Rita Pardini , Gian Pietro Pirola

We characterize contractible curves on proper normal algebraic surfaces in terms of complementary Weil divisors. Using this we generalize the classical criteria of Castelnuovo and Artin. As application we derive a finiteness result on…

Algebraic Geometry · Mathematics 2007-05-23 Stefan Schroeer

Let $M$ be a compact 3-manifold with a triangulation $\tau$. We give an inequality relating the Euler characteristic of a surface $F$ normally embedded in $M$ with the number of normal quadrilaterals in $F$. This gives a relation between a…

Geometric Topology · Mathematics 2008-10-02 Tejas Kalelkar

We resolve pathological wall-crossing phenomena for moduli spaces of sheaves on higher-dimensional base manifolds. This is achieved by considering slope-semistability with respect to movable curves rather than divisors. Moreover, given a…

Algebraic Geometry · Mathematics 2018-04-19 Daniel Greb , Matei Toma

We show that the orthogonality conjecture for divisorial Zariski decompositions on compact Kahler manifolds holds for pseudoeffective (1,1) classes with volume zero.

Complex Variables · Mathematics 2019-03-12 Valentino Tosatti

We compute tautological integrals over Quot schemes on curves and surfaces. After obtaining several explicit formulas over Quot schemes of dimension 0 quotients on curves (and finding a new symmetry), we apply the results to tautological…

Algebraic Geometry · Mathematics 2022-02-02 Dragos Oprea , Rahul Pandharipande

We explore some intersection properties of divisors associated to polarized dynamical systems on algebraic surfaces. As a consequence, we obtain necessary geometric conditions for the existence of polarizations of hyperbolic type and…

Algebraic Geometry · Mathematics 2019-09-10 Jorge Pineiro

We describe a sequence of effective divisors on the Hurwitz space $H_{d,g}$ for $d$ dividing $g-1$ and compute their cycle classes on a partial compactification. These divisors arise from vector bundles of syzygies canonically associated to…

Algebraic Geometry · Mathematics 2018-05-03 Anand Deopurkar , Anand Patel

This paper studies first the differential inequalities that make it possible to build a global theory of pseudo-holomorphic functions in the case of one or several complex variables. In the case of one complex dimension, we prove that the…

Complex Variables · Mathematics 2016-06-28 Giampiero Esposito , Raju Roychowdhury

For conic bundles on a smooth variety (over a field of characteristic $\ne 2$) which degenerate into pairs of distinct lines over geometric points of a smooth divisor, we prove a theorem which relates the Brauer class of the non-degenerate…

alg-geom · Mathematics 2008-02-03 Nitin Nitsure

This is the first part of our work on Zariski decomposition structures, where we study Zariski decompositions using Legendre-Fenchel type transforms. In this way we define a Zariski decomposition for curve classes. This decomposition…

Algebraic Geometry · Mathematics 2016-07-20 Brian Lehmann , Jian Xiao

In this paper and in its sequel [BKLV], we investigate the cone ${\rm Pseff}_n(C_d)$ of pseudoeffective $n$-cycles in the symmetric product $C_d$ of a smooth curve $C$. In the present paper, we study the convex-geometric properties of the…

Algebraic Geometry · Mathematics 2023-01-18 Francesco Bastianelli , Alexis Kouvidakis , Angelo Felice Lopez , Filippo Viviani

We study the restricted volume of effective divisors, its properties and the relationship with the related notion of reduced volume, defined via multiplier ideals, and with the asymptotic intersection number. We build upon the fundamental…

Algebraic Geometry · Mathematics 2012-07-06 Lorenzo Di Biagio , Gianluca Pacienza

We construct vector-valued modular forms on moduli spaces of curves and abelian varieties using effective divisors in projectivized Hodge bundles over moduli of curves. Cycle relations tell us the weight of these modular forms. In…

Algebraic Geometry · Mathematics 2023-09-07 Gerard van der Geer , Alexis Kouvidakis

We give an algebraic description of several modules and algebras related to the vector partition function, and we prove that they can be realized as the equivariant K-theory of some manifolds that have a nice combinatorial description. We…

K-Theory and Homology · Mathematics 2015-09-30 Francesco Cavazzani , Luca Moci

We consider the moduli space of log smooth pairs formed by a cubic surface and an anticanonical divisor. We describe all compactifications of this moduli space which are constructed using Geometric Invariant Theory and the anticanonical…

Algebraic Geometry · Mathematics 2020-10-02 Patricio Gallardo , Jesus Martinez-Garcia

We show that the cone over a fibered face of a compact fibered hyperbolic 3-manifold is dual to the cone generated by the homology classes of finitely many curves called minimal stable loops living in the associated veering triangulation.…

Geometric Topology · Mathematics 2019-03-22 Michael Landry

We construct and classify, in the case of two complex dimensions, the possible tangent cones at points of limit spaces of non-collapsed sequences of K\"ahler-Einstein metrics with cone singularities.

Differential Geometry · Mathematics 2021-10-26 Martin de Borbon

Cone spherical surfaces are orientable Riemannian surfaces with constant curvature one and a finite set of conical singularities. A subset of these surfaces, referred to as dihedral surfaces, is characterized by their monodromy groups,…

Geometric Topology · Mathematics 2024-04-04 Sicheng Lu , Bin Xu

In this work we derive a convex dual representation for increasing convex functionals on a space of real-valued Borel measurable functions defined on a countable product of metric spaces. Our main assumption is that the functionals fulfill…

Functional Analysis · Mathematics 2017-02-22 Daniel Bartl , Patrick Cheridito , Michael Kupper , Ludovic Tangpi
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