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We study real rational models of the euclidean plane $\mathbb{R}^2$ up to isomorphisms and up to birational diffeomorphisms. The analogous study in the compact case, that is the classification of real rational models of the real projective…

Algebraic Geometry · Mathematics 2022-06-13 Adrien Dubouloz , Frédéric Mangolte

We introduce a new invariant, the real (logarithmic)-Kodaira dimension, that allows to distinguish smooth real algebraic surfaces up to birational diffeomorphism. As an application, we construct infinite families of smooth rational real…

Algebraic Geometry · Mathematics 2023-06-22 Jérémy Blanc , Adrien Dubouloz

We study smooth rational closed embeddings of the real affine line into the real affine plane, that is algebraic rational maps from the real affine line to the real affine plane which induce smooth closed embeddings of the real euclidean…

Algebraic Geometry · Mathematics 2025-05-26 Adrien Dubouloz , Frédéric Mangolte

The addendum updates the results presented in the paper `Fake Projective Plane, Invent Math 168, 321-370 (2007)' and makes some additions and corrections. The fake projective planes are classified into twenty six classes. Together with a…

Algebraic Geometry · Mathematics 2015-05-13 Gopal Prasad , Sai-Kee Yeung

A fake projective plane is a smooth complex surface which is not the complex projective plane but has the same Betti numbers as the complex projective plane. The first example of such a surface was constructed by David Mumford in 1979 using…

Algebraic Geometry · Mathematics 2019-03-07 Gopal Prasad , Sai-Kee Yeung

A fake projective plane is a compact complex manifold of dimension 2 which has the same Betti numbers as the complex projective plane, but not isomorphic to the complex projective plane. As was shown by D. Mumford, there exists at least one…

Algebraic Geometry · Mathematics 2007-05-23 JongHae Keum

Fake projective planes are smooth complex surfaces of general type with Betti numbers equal to those of the usual projective plane. They come in complex conjugate pairs and have been classified as quotients of the two-dimensional ball by…

Algebraic Geometry · Mathematics 2020-12-16 Lev A. Borisov , JongHae Keum

Recently, Prasad and Yeung classified all possible fundamental groups of fake projective planes. According to their result, many fake projective planes admit a nontrivial group of automorphisms, and in that case it is isomorphic to…

Algebraic Geometry · Mathematics 2014-11-11 JongHae Keum

Fundamental groups of fake projective planes fall into fifty distinct isomorphism classes, one for each complex conjugate pair. We prove that this is not the case for their algebraic fundamental groups: there are only forty-six isomorphism…

Algebraic Geometry · Mathematics 2024-02-28 Matthew Stover

We find explicit equations of the fake projective plane $(a=7,p=2,\emptyset,D_3 X_7)$, which lies in the same class as the fake projective plane $(a=7,p=2,\emptyset,D_3 2_7)$ with $21$ automorphisms whose equations were previously found by…

Algebraic Geometry · Mathematics 2023-09-06 Lev Borisov , Mattie Ji , Yanxin Li

This paper is an addition to the book [54] on Compact projective planes. Such planes, if connected and finite-dimensional, have a point space of topological dimension 2, 4, 8, or 16, the classical example in the last case being the…

Geometric Topology · Mathematics 2017-06-13 Helmut R. Salzmann

Fake projective planes are smooth complex surfaces of general type with Betti numbers equal to that of the usual projective plane. Recent explicit constructions of fake projective planes embed them via their bicanonical embedding in…

Algebraic Geometry · Mathematics 2023-03-20 Lev Borisov , Zachary Lihn

We give a criterion for a projective surface to become a quotient of a fake projective plane. We also give a detailed information on the elliptic fibration of a $(2,3)$-elliptic surface that is the minimal resolution of a quotient of a fake…

Algebraic Geometry · Mathematics 2010-10-19 JongHae Keum

We show, for several fake projective planes with nontrivial automorphism group, that the bicanonical map is an embedding.

Algebraic Geometry · Mathematics 2018-03-28 Fabrizio Catanese , JongHae Keum

A fake projective plane is a complex surface with the same Betti numbers as $\mathbb{C} P^2$ but not biholomorphic to it. We study the fake projective plane $\mathbb{P}_{\operatorname{fake}}^2 = (a = 7, p = 2, \emptyset, D_3 2_7)$ in the…

Algebraic Geometry · Mathematics 2026-02-04 Lev Borisov , Mattie Ji , Yanxin Li , Sargam Mondal

We consider the class of profinite diffeological spaces, that is, diffeological spaces which diffeologies are deduced by pull-back of diffeologies on finite-dimensional manifolds through a system of projection mappings. This class includes…

Differential Geometry · Mathematics 2025-10-29 Anahita Eslami-Rad , Jean-Pierre Magnot , Enrique G. Reyes

In the present article, we provide examples of fake quadrics, that is, minimal complex surfaces of general type with the same numerical invariants as the smooth quadric in $\PP ^3$ which are quotients of the bidisc by an irreducible lattice…

Algebraic Geometry · Mathematics 2013-05-23 Amir Džambić

We study real Campedelli surfaces up to real deformations and exhibit a number of such surfaces which are equivariantly diffeomorphic but not real deformation equivalent.

Algebraic Geometry · Mathematics 2007-05-23 V. Kharlamov , Vik. Kulikov

We construct the first examples of what we call fake ES-irreducible components; Definition 2.8. In our way to do so, we classify the automorphism groups of smooth plane sextics that only have automorphisms of order 3 or less; Theorems 2.1,…

Algebraic Geometry · Mathematics 2023-09-19 Eslam Badr , Francesc Bars

The real projective plane has three well know isomorphic constructions: the extended euclidean plane, unit (hemi)sphere, and three dimensional vector space over the reals. In this paper we find the isomorphisms that map between these three…

Algebraic Geometry · Mathematics 2024-03-05 Noah Everett , Patrick Fleming
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