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We prove a conjecture by A. Kuznetsov and A. Polishchuk on the existence of some particular full exceptional collections in bounded derived categories of coherent sheaves on Grassmannian varieties.

Algebraic Geometry · Mathematics 2016-04-07 Anton Fonarev

Let X ->Y be a Zariski locally trivial fibration of smooth complex projective varieties, with fiber F. We give a structure theorem for the derived category of X provided both F and Z have a full strongly exceptional collection of line…

Algebraic Geometry · Mathematics 2011-02-10 L. Costa , S. Di Rocco , R. M. Miró-Roig

We prove that the adjoint equivariant derived category of a reductive group $G$ is equivalent to the appropriately defined monoidal center of the torus-equivariant version of the Hecke category. We use this to give new proofs, independent…

Representation Theory · Mathematics 2024-06-13 Roman Bezrukavnikov , Andrei Ionov , Kostiantyn Tolmachov , Yakov Varshavsky

We show that the counting of rational curves on a complete toric variety that are in general position to the toric prime divisors coincides with the counting of certain tropical curves. The proof is algebraic-geometric and relies on…

Algebraic Geometry · Mathematics 2007-05-23 Takeo Nishinou , Bernd Siebert

Let X be a smooth, complete, toric variety. We study those curves C in X that are contractible, in the sense that there exists an equivariant morphism with connected fibers, with source X, that contracts exactly the irreducible curves that…

Algebraic Geometry · Mathematics 2007-05-23 Cinzia Casagrande

We construct a full, strongly exceptional collection of line bundles on the variety X that is the blow up of the projectivization of the vector bundle O_{P^{n-1}}\oplus O_{P^{n-1}}(b) along a linear space of dimension n-2, where b is a…

Algebraic Geometry · Mathematics 2010-02-19 Arijit Dey , Michal Lason , Mateusz Michalek

We describe a class of affine toric varieties $V$ that are set-theoretically minimally defined by codim $V+1$ binomial equations over fields of any characteristic.

Algebraic Geometry · Mathematics 2007-05-23 Margherita Barile

We prove a conjecture of Shokurov which characterises toric varieties using log pairs.

Algebraic Geometry · Mathematics 2018-05-23 Morgan Brown , James McKernan , Roberto Svaldi , Hong Zong

We investigate the properties of pure derived categories of module categories, and show that pure derived categories share many nice properties of classical derived categories. In particular, we show that bounded pure derived categories can…

Representation Theory · Mathematics 2016-01-28 Yuefei Zheng , Zhaoyong Huang

We give an explicit description of the automorphism group of a product of complete toric varieties over an arbitrary field in terms of the respective automorphism groups of its components. More precisely, we prove that, up to permutation of…

Algebraic Geometry · Mathematics 2022-11-29 Alvaro Liendo , Giancarlo Lucchini Arteche

We study certain toric Gorenstein varieties with isolated singularities which are the quotient spaces of generic unimodular representations by the one-dimensional torus, or by the product of the one-dimensional torus with a finite abelian…

Algebraic Geometry · Mathematics 2024-11-28 Xiaojun Chen , Leilei Liu , Jieheng Zeng

Following ideas of Lawvere and Linton we prove that classical varieties are precisely the exact categories with a varietal generator. This means a strong generator which is abstractly finite and regularly projective. An analogous…

Category Theory · Mathematics 2024-02-23 Jiri Adamek

Toric subvarieties of projective space are classified up to projective automorphisms.

Representation Theory · Mathematics 2019-09-11 Friedrich Knop , Rainer Sinn

In this paper we describe the notion of a toric supervariety, generalizing that of a toric variety from the classical setting. We give a combinatorial interpretation of the category of quasinormal toric supervarieties with one odd dimension…

Algebraic Geometry · Mathematics 2023-05-08 Eric Jankowski

Let $\text{X}$ denote a projective variety over an algebraically closed field on which a linear algebraic group acts with finitely many orbits. Then, a conjecture of Soergel and Lunts in the setting of Koszul duality and Langlands'…

Algebraic Geometry · Mathematics 2020-03-24 Roy Joshua

This paper contains two results concerning the equivariant K-theory of toric varieties. The first is a formula for the equivariant K-groups of an arbitrary affine toric variety, generalizing the known formula for smooth ones. In fact, this…

K-Theory and Homology · Mathematics 2008-09-22 Suanne Au , Mu-wan Huang , Mark E. Walker

We relate invariants in derived categories associated to tame actions of finite groups on projective varieties over a finite field to zeros of L-functions

Number Theory · Mathematics 2013-02-01 Philippe Cassou-Noguès , Ted Chinburg , Boas Erez , Martin. J. Taylor

We study derived categories of coherent sheaves on abelian varieties. We give a criterion for the equivalence of the derived categories on two abelian varieties. We describe the autoequivalence group for the derived category of coherent…

alg-geom · Mathematics 2025-07-25 Dmitri Orlov

We develop the theory of exact completions of regular $\infty$-categories, and show that the $\infty$-categorical exact completion (resp. hypercompletion) of an abelian category recovers the connective half of its bounded (resp. unbounded)…

Category Theory · Mathematics 2023-10-20 Germán Stefanich

Recent advances in computational techniques for $K$-theory allow us to describe the $K$-theory of toric varieties in terms of the $K$-theory of fields and simple cohomological data.

K-Theory and Homology · Mathematics 2011-08-03 Guillermo Cortiñas , Christian Haesemeyer , Mark E. Walker , Charles Weibel