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We construct a smooth complex projective rational surface with infinitely many mutually non-isomorphic real forms. This gives the first definite answer to a long standing open question if a smooth complex projective rational surface has…

Algebraic Geometry · Mathematics 2022-11-29 Tien-Cuong Dinh , Keiji Oguiso , Xun Yu

We describe smooth rational projective algebraic surfaces over an algebraically closed field of characteristic different from 2 which contain $n \ge \b_2-2$ disjoint smooth rational curves with self-intersection -2, where $\b_2$ is the…

Algebraic Geometry · Mathematics 2007-05-23 Igor Dolgachev , Margarida Mendes Lopes , Rita Pardini

The developable surface is an important surface in computer aided design, geometric modeling and industrial manufactory. It is often given in the stan- dard parametric form, but it can also be in the implicit form which is commonly used in…

Symbolic Computation · Computer Science 2013-05-14 Sonia Perez-Diaz , Li-Yong Shen

We give a classification of all principally polarized abelian surfaces that admit an $(l,l)$-isogeny to themselves, and show how to compute all the abelian surfaces that occur. We make the classification explicit in the simplest case $l=2$.…

Algebraic Geometry · Mathematics 2013-02-13 Reinier Broker , Kristin Lauter , Marco Streng

We classify the topological types of surfaces in the 3-dimensional unit sphere that contain both a great and a small circle through each point. In particular, these surfaces are homeomorphic to one of five normal forms and are either the…

Algebraic Geometry · Mathematics 2025-11-20 Niels Lubbes

This book is expository and is in Russian. It is shown how in the course of solution of interesting geometric problems (close to applications) naturally appear main notions of algebraic topology (homology groups, obstructions and…

Geometric Topology · Mathematics 2016-05-18 A. Skopenkov

These are lecture notes of a course given in Pisa, SNS, in february 2002. They provide a classification of holomorphic foliations of nongeneral type on compact Kaehler surfaces.

Complex Variables · Mathematics 2007-05-23 Marco Brunella

This is an exposition of the homological classification of actions of surface groups on the plane, in every degree of smoothness.

Dynamical Systems · Mathematics 2009-10-16 Danny Calegari

In the present note we describe geometrically the homology classes in the total space of a surface bundle over a surface in terms of the holonomy map. We treat the cases where the base surface is closed or has one boundary component. We…

Geometric Topology · Mathematics 2016-05-12 Caterina Campagnolo

In this paper we prove that no complex surface of general type is diffeomorphic to a rational surface, thereby completing the smooth classification of rational surfaces and the proof of the Van de Ven conjecture on the smooth invariance of…

alg-geom · Mathematics 2009-10-22 Robert Friedman , Zhenbo Qin

The article surveys published and not yet published results about moduli spaces of algebraic surfaces.

Algebraic Geometry · Mathematics 2008-12-24 Fabrizio Catanese

We give a short, mostly elementary and self-contained proof of the classical result that the groups of diffeomorphisms, homeomorphisms, and homotopy equivalences of a surface have the same group of connected components.

General Topology · Mathematics 2009-08-18 Søren Kjærgaard Boldsen

We classify meromorphic affine connections on compact complex surfaces with algebraic dimension one, extending the work of Inoue,Kobayashi and Ochiai (1981) in the holomorphic case. The motivation is to investigate possible extension of the…

Algebraic Geometry · Mathematics 2024-03-14 Alexis Garcia

This is a first graduate course in algebraic geometry. It aims to give the student a lift up into the subject at the research level, with lots of interesting topics taken from the classification of surfaces, and a human-oriented discussion…

alg-geom · Mathematics 2015-06-30 Miles Reid

We study complex spatial quartic surfaces with simple singularities up to equisingular deformations; as a first step, give a complete equisingular deformation classification of the so-called non-special simple quartic surfaces.

Algebraic Geometry · Mathematics 2015-08-24 Çisem Güneş Aktaş

Fukaya categories are deep and rich invariants of symplectic manifolds which are notoriously difficult to compute explicitly. In the case of surfaces, however, the situation is simple, combinatorial,and is very well understood (at least by…

Symplectic Geometry · Mathematics 2025-10-14 Chris Grossack

This article uses homological methods for evaluating compactly supported cohomology groups of noncompact toric surfaces

K-Theory and Homology · Mathematics 2015-05-26 Malgorzata Aneta Marciniak

We prove a suite of results classifying holomorphic maps between configuration spaces of Riemann surfaces; we consider both the ordered and unordered setting as well as the cases of genus zero, one, and at least two. We give a complete…

Geometric Topology · Mathematics 2023-04-26 Lei Chen , Nick Salter

We present a method for computing projective isomorphisms between rational surfaces that are given in terms of their parametrizations. The main idea is to reduce the computation of such projective isomorphisms to five base cases by…

Algebraic Geometry · Mathematics 2021-12-20 Bert Jüttler , Niels Lubbes , Josef Schicho

In the paper "Algebraic classification of rational CR structures on topological 5-sphere with transversal holomorphic S^1-action in C^4" (Yau and Yu, Math. Nachrichten 246-247(2002), 207-233), we give algebraic classification of rational CR…

Algebraic Geometry · Mathematics 2007-05-23 Stephen S. -T. Yau , Yung Yu