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In this paper, we investigate Fano manifolds whose Chern characters satisfy some positivity conditions. We prove that such manifolds admit long chains of higher order minimal families of rational curves and are covered by higher rational…

Algebraic Geometry · Mathematics 2024-07-19 Taku Suzuki

We give a necessary and sufficient condition for a generalized Bott manifold to be Fano or weak Fano. As a consequence we characterize Fano Bott manifolds.

Algebraic Geometry · Mathematics 2018-11-16 Yusuke Suyama

Based on the former parts, we classify smooth Fano threefolds of positive characteristic.

Algebraic Geometry · Mathematics 2025-12-04 Hiromu Tanaka

We classify primitive Fano threefolds in positive characteristic whose Picard numbers are at least two. We also classify Fano theefolds of Picard rank two.

Algebraic Geometry · Mathematics 2025-07-24 Masaya Asai , Hiromu Tanaka

Over an algebraically closed field of positive characteristic, we classify smooth Fano threefolds of Picard number one whose anti-canonical linear systems are not very ample. Furthermore, we also prove that an anti-canonically embedded Fano…

Algebraic Geometry · Mathematics 2026-03-13 Hiromu Tanaka

We investigate Fano varieties defined over a number field that contain subvarieties whose number of rational points of bounded height is comparable to the total number on the variety.

Number Theory · Mathematics 2017-03-23 T. D. Browning , D. Loughran

In this paper we classify n-dimensional Fano manifolds with index >=n-2 and positive second Chern character.

Algebraic Geometry · Mathematics 2012-06-08 Carolina Araujo , Ana-Maria Castravet

This note outlines some first steps in the classification of Fano manifolds for which $c_1^2-2c_2$ is positive or nef.

Algebraic Geometry · Mathematics 2007-05-23 A. J. de Jong , Jason Michael Starr

In this paper we address Fano manifolds with positive higher Chern characters. They are expected to enjoy stronger versions of several of the nice properties of Fano manifolds. For instance, they should be covered by higher dimensional…

We classify complex projective manifolds $X$ for which there exists a point $a$ such that the blow-up of $X$ at $a$ is Fano.

Algebraic Geometry · Mathematics 2007-05-23 L. Bonavero , F. Campana , J. A. Wiśniewski

We give a characterization of Fano type surfaces with large cyclic automorphisms.

Algebraic Geometry · Mathematics 2020-01-14 Joaquín Moraga

We prove that a weak Fano manifold has unobstructed deformations. For a general variety, we investigate conditions under which a variety is necessarily obstructed.

Algebraic Geometry · Mathematics 2013-05-23 Taro Sano

We investigate the geometry of codimension one foliations on smooth projective varieties defined over fields of positive characteristic with an eye toward applications to the structure of codimension one holomorphic foliations on projective…

Algebraic Geometry · Mathematics 2024-11-20 Wodson Mendson , Jorge Vitório Pereira

We prove a characterization of Fano type varieties.

Algebraic Geometry · Mathematics 2026-03-17 Yiming Zhu

We give the first examples of flat fiber type contractions of Fano manifolds onto varieties that are not weak Fano, and we prove that these morphisms are Fano conic bundles. We also review some known results about the interaction between…

Algebraic Geometry · Mathematics 2017-03-09 Eleonora Anna Romano

We classify Fano manifolds X containing a divisor E isomorphic to projective space such that the normal bundle $N_{E/X}$ is strictly negative.

Algebraic Geometry · Mathematics 2007-05-23 Toru Tsukioka

We consider weak Fano manifolds with small contractions obtained by blowing up successively curves and subvarieties of codimension 2 in products of projective spaces. We give a classification result for a special case. In the process of…

Algebraic Geometry · Mathematics 2016-10-25 Toru Tsukioka

Consider a smooth log Fano variety over the function field of a curve. Suppose that the boundary has positive normal bundle. Choose an integral model over the curve. Then integral points are Zariski dense, after removing an explicit finite…

Algebraic Geometry · Mathematics 2009-11-13 Brendan Hassett , Yuri Tschinkel

We consider the problem to determine which blow-ups along subvarieties in products of two projective spaces are log Fano. By describing the nef cones of such blow-ups with special centers, we give a partial classification result. For each…

Algebraic Geometry · Mathematics 2018-09-25 Toru Tsukioka

We classify Fano fivefolds of index two which are blow-ups of smooth manifolds along a smooth center.

Algebraic Geometry · Mathematics 2017-09-29 Elena Chierici , Gianluca Occhetta
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