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In this paper, we generalise the theory of complements to log canonical log fano varieties and prove boundedness of complements for them in dimension less than or equal to 3. We also prove some boundedness results for the canonical index of…

Algebraic Geometry · Mathematics 2019-01-15 Yanning Xu

We establish upper bounds for the complexity of Seifert fibered manifolds with nonempty boundary. In particular, we obtain potentially sharp bounds on the complexity of torus knot complements.

Geometric Topology · Mathematics 2013-02-18 Evgeny Fominykh , Bert Wiest

We establish asymptotic formulas for the number of integral points of bounded height on toric varieties.

Number Theory · Mathematics 2012-02-23 Antoine Chambert-Loir , Yuri Tschinkel

We obtain upper bounds on the number of singular points of factorial terminal Fano threefolds.

Algebraic Geometry · Mathematics 2017-08-02 Yu. Prokhorov

This paper demonstrates the existence of $\mathbb{Q}$-complements for algebraically integrable log-Fano foliations on klt ambient varieties. Additionally, we investigate properties of algebraically integrable Fano foliations such as a…

Algebraic Geometry · Mathematics 2024-08-22 Yen-An Chen , Dongchen Jiao , Pascale Voegtli

In this note we collect some results on the deformation theory of toric Fano varieties.

Algebraic Geometry · Mathematics 2022-06-22 Andrea Petracci

We discuss boundedness of toric Fano foliations and connectedness of its dicritical and singular loci. Moreover, we show the set of interpolated $\delta$-lcts for the toric foliations satisfies the descending chain condition.

Algebraic Geometry · Mathematics 2025-02-18 Chih-Wei Chang , Yen-An Chen

We give a characterization of Gorenstein toric Fano varieties of dimension $n$ with index $n$ among toric varieties. As an application, we give a strong version of Fujita's freeness conjecture and also give a simple proof of Fujita's very…

Algebraic Geometry · Mathematics 2014-04-29 Shoetsu Ogata , Huai-Liang Zhao

We give a necessary and sufficient condition for the nonsingular projective toric variety associated to a finite simple graph to be Fano or weak Fano in terms of the graph.

Algebraic Geometry · Mathematics 2016-05-17 Yusuke Suyama

We formulate a conjecture on the number of integral points of bounded height on log Fano varieties in analogy with Manin's conjecture on the number of rational points of bounded height on Fano varieties. We also give a prediction for the…

Number Theory · Mathematics 2025-08-04 Tim Santens

For Fano fibrations with $\epsilon$-lc singularities of a fixed dimension, we show the existence of bounded relative-global complements. If the base of the fibration is of dimension one, we even show the existence of bounded relative-global…

Algebraic Geometry · Mathematics 2024-02-20 Sung Rak Choi , Chuyu Zhou

For Fano varieties of various singularities such as canonical and terminal, we construct examples with large Fano index. By low-dimensional evidence, we conjecture that our examples have the largest Fano index for all dimensions.

Algebraic Geometry · Mathematics 2023-08-15 Chengxi Wang

We investigate the variation of log canonical thresholds in (graded) linear systems. For toric log Fano varieties, we give a sharp lower bound for log canonical thresholds of the anticanonical members in terms of the global minimal log…

Algebraic Geometry · Mathematics 2014-11-12 Florin Ambro

In this paper, we study the explicit geometry of threefolds, in particular, Fano varieties. We find an explicitly computable positive integer $N$, such that all but a bounded family of Fano threefolds have $N$-complements. This result has…

Algebraic Geometry · Mathematics 2023-11-14 Caucher Birkar , Jihao Liu

In this short note, based on the work of Wang-Zhu, we determine the greatest lower bounds on Ricci curvature for all toric Fano manifolds.

Differential Geometry · Mathematics 2009-09-21 Chi Li

We prove the boundedness of complements for Fano type generalized pairs (with the boundary coefficient set $[0,1]$) after Shokurov.

Algebraic Geometry · Mathematics 2025-07-31 Guodu Chen , Jingjun Han , Yang He , Lingyao Xie

We improve the previuosly known bound for some vertex Folkman numbers.

Combinatorics · Mathematics 2007-05-23 N. Kolev , N. Nenov

We find an explicit upper bound for the anticanonical volume of Fano 4-folds with canonical singularities.

Algebraic Geometry · Mathematics 2022-09-20 Caucher Birkar

In this paper, we give the complete classification of full exceptional collections on smooth toric Fano threefolds and fourfolds with Picard rank two. To be precise, we give a partial answer to the conjecture in \cite{Kuz} and \cite{LYY}:…

Algebraic Geometry · Mathematics 2023-03-08 Dae-Won Lee

Fix two positive integers $d\geq3$ and $q$. We give an upper bound for anti-canonical volumes of $d$-dimensional $\frac{1}{q}$-lc toric Fano varieties, which corresponds to an upper bound for the dual normalized volumes of the associated…

Algebraic Geometry · Mathematics 2024-11-26 Yu Zou
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