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We prove Kawaguchi-Silverman conjecture for all surjective endomorphisms on every smooth rationally connected variety admitting an int-amplified endomorphism.

Algebraic Geometry · Mathematics 2019-09-02 Yohsuke Matsuzawa , Shou Yoshikawa

We investigate the common underlying discrete structures for various smooth and discrete nets. The main idea is to impose the characteristic properties of the nets not only on elementary quadrilaterals but also on larger parameter…

Differential Geometry · Mathematics 2018-02-15 Alexander I. Bobenko , Helmut Pottmann , Thilo Rörig

We consider linear systems on toric varieties of any dimension, with invariant base points, giving a characterization of special linear systems. We then make a new conjecture for linear systems on rational surfaces.

Algebraic Geometry · Mathematics 2007-05-23 Antonio Laface , Luca Ugaglia

Let $f \colon X \to X$ be a surjective endomorphism of a normal projective surface. When $\operatorname{deg} f \geq 2$, applying an (iteration of) $f$-equivariant minimal model program (EMMP), we determine the geometric structure of $X$.…

Algebraic Geometry · Mathematics 2023-01-11 Jia Jia , Junyi Xie , De-Qi Zhang

We show that a holomorphic two-form $\theta$ on a smooth algebraic variety X localizes the virtual fundamental class of the moduli of stable maps $\mgn(X,\beta)$ to the locus where $\theta$ degenerates; it then enables us to define the…

Algebraic Geometry · Mathematics 2007-07-23 Young-Hoon Kiem , Jun Li

We show how several results about p-adic lattices generalize easily to lattices over valuation ring of arbitrary rank having only the Henselian property for quadratic polynomial. If 2 is invertible we obtain the uniqueness of the Jordan…

Commutative Algebra · Mathematics 2020-08-12 Shaul Zemel

We study the group of self-equivalences of a partially postcritically finite branched cover and answer a question of Adam Epstein about contractibility of certain deformation spaces of rational maps.

Dynamical Systems · Mathematics 2024-01-01 Tanya Firsova , Jeremy Kahn , Nikita Selinger

We give a new proof of the classification of normal singular surface germs admitting non-invertible holomorphic self-maps and due to J. Wahl. We then draw an analogy between the birational classification of singular holomorphic foliations…

Algebraic Geometry · Mathematics 2010-03-16 Charles Favre

Many classes of maps are characterized as (possibly multi-valued) maps preserving particular types of compact filters.

General Topology · Mathematics 2010-02-17 F. Mynard

We give a description of a weakly continuous rank preserving map on a reflexive algebra on complex Hilbert space with commutative completely distributive subspace lattice. We show that the implementation of a rank preserving map can be…

Operator Algebras · Mathematics 2007-05-23 Jaedeok Kim , Robert L. Moore

This study defines finite-type invariants for curves on surfaces and reveals the construction of these finite-type invariants for stable homeomorphism classes of curves on compact oriented surfaces without boundaries. These invariants are a…

Geometric Topology · Mathematics 2008-10-15 Noboru Ito

For a two-dimensional surface in the four-dimensional Euclidean space we introduce an invariant linear map of Weingarten type in the tangent space of the surface, which generates two invariants k and kappa. The condition k = kappa = 0…

Differential Geometry · Mathematics 2008-04-29 Georgi Ganchev , Velichka Milousheva

The purpose of this article is to study the deformations of smooth surfaces $X$ of general type whose canonical map is a finite, degree 2 morphism onto a minimal rational surface or onto $\mathbf F_1$, embedded in projective space by a very…

Algebraic Geometry · Mathematics 2010-06-01 Francisco Javier Gallego , Miguel González , Bangere P. Purnaprajna

Any counterexample to the two-dimensional Jacobian Conjecture gives a rational map from one projective plane to another. We use some ideas of the Minimal Model Program to study the combinatorial structure of a rational surface, that is…

Algebraic Geometry · Mathematics 2009-12-25 Alexander Borisov

We classify surfaces of general type whose bicanonical map is composed with a rational map of degree 2 onto a rational or ruled surface.

Algebraic Geometry · Mathematics 2007-05-23 Giuseppe Borrelli

We classify those rational maps $f: \mathbb{P}^1 \to \mathbb{P}^1$ for which there exists a contravariant tensor $q$ which is parallel, i.e. such that $f^*q // q$, by proving that such maps preserve a parabolic orbifold.

Dynamical Systems · Mathematics 2018-06-27 Jacopo Garofali

We investigate the universal Severi variety of rational curves on K3 surfaces, which parametrises irreducible rational curves in a fixed class on varying K3 surfaces of fixed genus. We investigate the conjecuted irreducibility of this space…

Algebraic Geometry · Mathematics 2014-07-23 Michael Kemeny

We give several versions of local and global inverse mapping theorem for tame non necessarily smooth, mappings. Here tame mapping means a mapping which is subanalytic or, more generally, definable in some o-minimal structure. Our sufficient…

Geometric Topology · Mathematics 2007-12-18 Toshizumi Fukui , Krzysztof Kurdyka , Laurentiu Paunescu

Let X be a variety over a number field and let f: X --> X be an "interesting" rational self-map with a fixed point q. We make some general remarks concerning the possibility of using the behaviour of f near q to produce many rational points…

Algebraic Geometry · Mathematics 2019-02-20 Ekaterina Amerik , Fedor Bogomolov , Marat Rovinsky

We study rational curves on general Fano hypersurfaces in projective space, mostly by degenerating the hypersurface along with its ambient projective space to reducible varieties. We prove results on existence of low-degree rational curves…

Algebraic Geometry · Mathematics 2020-03-11 Ziv Ran