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Cubic surfaces in characteristic two are investigated from the point of view of prime characteristic commutative algebra. In particular, we prove that, the non-Frobenius split cubic surfaces form a linear subspace of codimension four in the…

Commutative Algebra · Mathematics 2022-05-16 Zhibek Kadyrsizova , Jennifer Kenkel , Janet Page , Jyoti Singh , Karen E. Smith , Adela Vraciu , Emily E. Witt

We prove the well-definedness of some deformations of the fibred biset category in characteristic zero. The method is to realize the fibred biset category and the deformations as the invariant parts of some categories whose compositions are…

Representation Theory · Mathematics 2021-07-27 Laurence Barker , İsmail Alperen Öğüt

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

Some geometry on non-singular cubic curves, mainly over finite fields, is surveyed. Such a curve has 9,3,1 or 0 points of inflexion, and cubic curves are classified accordingly. The group structure and the possible numbers of rational…

Number Theory · Mathematics 2011-07-25 A. A. Bruen , J. W. P. Hirschfeld , D. L. Wehlau

We provide a classification of complex projective surfaces with a holomorphic foliation whose group of birational symetries is infinite.

Complex Variables · Mathematics 2007-05-23 S. Cantat , C. Favre

It is presented an example of a holomorphic foliation of a non-algebraizable surface which is topologically equivalent to an algebraic foliation.

Complex Variables · Mathematics 2025-04-28 Paulo Sad

We study del Pezzo fibrations of degree 1 with terminal singularities. A connection between singularities on del Pezzo surfaces of degree 1 and Kodaira's classification of elliptic singular fibers will be studied in this paper. By this…

Algebraic Geometry · Mathematics 2007-05-23 Jihun Park

We introduce in this paper a field theory on symplectic manifolds that are fibered over a real surface with interior marked points and cylindrical ends. We assign to each such object a morphism between certain tensor products of quantum and…

Symplectic Geometry · Mathematics 2014-11-11 Francois Lalonde

We study real trigonal curves and elliptic surfaces of type $\I$ (over a base of an arbitrary genus) and their fiberwise equivariant deformations. The principal tool is a real version of Grothendieck's \emph{dessins d'enfants}. We give a…

Algebraic Geometry · Mathematics 2014-06-06 Alex Degtyarev , Ilia Itenberg , Victor Zvonilov

(1,d)-polarized abelian surfaces in P^(d-1) with two plane cubic curve fibrations lie in two elliptic P^2-scrolls. The union of these scrolls form a reducible Calabi-Yau 3-fold. In this paper we show that this occurs when d<10 and analyse…

Algebraic Geometry · Mathematics 2007-05-23 Klaus Hulek , Kristian Ranestad

This article primarily aims at classifying, on certain K3 surfaces, the elliptic fibrations induced by conic bundles on smooth del Pezzo surfaces. The key geometric tool employed is the Alexeev-Nikulin correspondence between del Pezzo…

Algebraic Geometry · Mathematics 2024-03-28 Paola Comparin , Pedro Montero , Yulieth Prieto-Montañez , Sergio Troncoso

We develop the quadratic technique of proving birational rigidity of Fano-Mori fibre spaces over a higher-dimensional base. As an application, we prove birational rigidity of generic fibrations into Fano double spaces of dimension…

Algebraic Geometry · Mathematics 2017-12-15 Aleksandr V. Pukhlikov

We consider the stable ruled surface $S_1$ over an elliptic curve. There is a unique foliation on $S_1$ transverse to the fibration. The minimal self-intersection sections also define a 2-web. We prove that the 4-web defined by the…

Complex Variables · Mathematics 2019-03-04 Adjaratou Arame Diaw

The geometry of elliptic fibrations translates to the physics of gauge theories in F-theory. We systematically develop the dictionary between arithmetic structures on elliptic curves as well as desingularized elliptic fibrations and…

High Energy Physics - Theory · Physics 2016-07-20 Thomas W. Grimm , Andreas Kapfer , Denis Klevers

This note describes minimal surfaces $S$ of general type satisfying $p_g\geq 5$ and $K^2=2p_g$. For $p_g\geq 8$ the canonical map of such surfaces is generically finite of degree 2 and the bulk of the paper is a complete characterization of…

Algebraic Geometry · Mathematics 2010-03-19 Maria Marti Sanchez

PhD dissertation consists in three lines of investigation involving rational elliptic surfaces, namely 1) a study of conic bundles on these surfaces; 2) an investigation of the possible intersection numbers of two sections and 3) a theorem…

Algebraic Geometry · Mathematics 2023-02-14 Renato Dias Costa

This paper completes the classification of regular Lagrangian fibratiopns over compact surfaces. \cite{misha} classifies regular Lagrangian fibrations over $\mathbb{T}^2$. The main theorem in \cite{hirsch} is used in order to classify…

Symplectic Geometry · Mathematics 2010-01-05 D. Sepe

This article initiates the study of isotrivial Lagrangian fibrations of compact hyper-K\"ahler manifolds. We present four foundational results that extend well-known facts about isotrivial elliptic fibrations of K3 surfaces. First, we prove…

Algebraic Geometry · Mathematics 2024-09-16 Yoon-Joo Kim , Radu Laza , Olivier Martin

This article contains the notes of a graduate course on birational geometry focusing on the minimal model program. Topics covered include singularities, vanishing, nonvanishing, cone and contraction, base point freeness, finite generation,…

Algebraic Geometry · Mathematics 2007-06-14 Caucher Birkar

An isotrivially fibred surface is a smooth projective surface endowed with a morphism onto a curve such that all the smooth fibres are isomorphic to each other. The first goal of this paper is to classify the isotrivially fibred surfaces…

Algebraic Geometry · Mathematics 2015-03-13 Matteo Penegini