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We give a complete description of the cohomology ring $A^*(\overline Z)$ of a compactification of a linear subvariety $Z$ of a torus in a smooth toric variety whose fan $\Sigma$ is supported on the tropicalization of $Z$. It turns out that…

Algebraic Geometry · Mathematics 2016-12-01 Andreas Gross

We prove that the intersection homology Poincare' polynomial P(X) of an affine toric variety X is bounded below by the product P(Y)P(X/Y), where Y is the closure of any orbit in X and X/Y is a slice transverse to the orbit. This proves a…

alg-geom · Mathematics 2008-02-03 Tom C. Braden , Robert D. MacPherson

We present a construction of noncommutative double mirrors to complete intersections in toric varieties. This construction unifies existing sporadic examples and explains the underlying combinatorial and physical reasons for their…

Algebraic Geometry · Mathematics 2016-02-22 Lev Borisov , Zhan Li

In this paper we prove the Geyer-Jarden conjecture on the torsion part of the Mordell-Weil group for a large class of abelian varieties defined over finitely generated fields of arbitrary characteristic. The class consists of all abelian…

Algebraic Geometry · Mathematics 2012-01-12 Sara Arias-de-Reyna , Wojciech Gajda , Sebastian Petersen

This short note regards an observation about the recent theory of prismatic cohomology developed by Bhatt and Scholze. In particular, by applying a functor of Mandell, we see that the \'etale comparison theorem in the prismatic theory…

Algebraic Geometry · Mathematics 2021-07-07 Tobias Shin

Firstly we show a generalization of the (1,1)-Lefschetz theorem for projective toric orbifolds and secondly we prove that on 2k-dimensional quasi-smooth hypersurfaces coming from quasi-smooth intersection surfaces, under the Cayley trick,…

Algebraic Geometry · Mathematics 2023-02-09 William D. Montoya

In this paper, we prove that: For any given finitely many distinct points $P_1,...,P_r$ and a closed subvariety $S$ of codimension $\geq 2$ in a complete toric variety over a uncountable (characteristic 0) algebraically closed field, there…

Algebraic Geometry · Mathematics 2009-05-12 Yifei Chen , Vyacheslav Shokurov

In this paper we give a combinatorial view on the adjunction theory of toric varieties. Inspired by classical adjunction theory of polarized algebraic varieties we define two convex-geometric notions: the Q-codegree and the nef value of a…

Combinatorics · Mathematics 2016-01-20 Sandra Di Rocco , Christian Haase , Benjamin Nill , Andreas Paffenholz

We provide an inductive algorithm computing Gromov-Witten invariants in all genera with arbitrary insertions of all smooth complete intersections in projective space. We also prove that all Gromov-Witten classes of all smooth complete…

Algebraic Geometry · Mathematics 2023-01-12 Hülya Argüz , Pierrick Bousseau , Rahul Pandharipande , Dimitri Zvonkine

This paper explicitly describes Hodge structures of complete intersections of ample hypersurfaces in compact simplicial toric varieties.

alg-geom · Mathematics 2007-05-23 Anvar R. Mavlyutov

We formulate characteristic $p$ analogues of the Mumford--Tate and the Andr\'e--Oort conjectures for ordinary mod $p$ Shimura varieties of Hodge type, and set up general frameworks for studying them. We prove the two conjectures for…

Number Theory · Mathematics 2025-12-02 Ruofan Jiang

We compute the alpha invariant of any smooth complex projective spin complete intersection of complex dimension $1 \; ({\rm mod} \; 4)$. We prove that the alpha invariant depends only on the total degree and Pontryagin classes. Our findings…

Differential Geometry · Mathematics 2020-02-18 David Baraglia

We prove a conjecture of Sturmfels, Timme and Zwiernik on the ML-degrees of linear covariance models in algebraic statistics. As in our previous works on linear concentration models, the proof ultimately relies on the computation of certain…

Algebraic Geometry · Mathematics 2021-08-26 Laurent Manivel

The slope of a p-adic overconvergent eigenform of weight k is the p-adic valuation of its U_p eigenvalue. We find the slope of all 2-adic finite slope overconvergent eigenforms of tame level 1 and weight 0. As a consequence we prove that…

Number Theory · Mathematics 2007-05-23 Kevin Buzzard , Frank Calegari

We apply ideas from intersection theory on toric varieties to tropical intersection theory. We introduce mixed Minkowski weights on toric varieties which interpolate between equivariant and ordinary Chow cohomology classes on complete toric…

Algebraic Geometry · Mathematics 2009-07-16 Eric Katz

We extend the usual projective Abel-Radon transform to the larger context of a smooth complete toric variety X. We define and study toric concavity attached to an algebraic splitting vector bundle on X and we prove a toric version of the…

Complex Variables · Mathematics 2009-03-27 Martin Weimann

In this paper we prove the Knop conjecture asserting that two smooth affine spherical varieties with the same weight monoids are equivariantly isomorphic. We also state and prove a uniqueness property for not necessarily smooth affine…

Algebraic Geometry · Mathematics 2010-06-03 Ivan V. Losev

We study surjective endomorphisms of projective bundles over toric varieties, achieving three main results. First, we provide a structural theorem describing endomorphisms of projectivized split bundles over arbitrary base varieties, which…

Algebraic Geometry · Mathematics 2025-10-31 Javier González-Anaya , Brett Nasserden , Sasha Zotine

We study the algbraic dynamics for endomorphisms of projective spaces with coefficients in a p-adic field whose reduction in positive characteritic is the Frobenius. In particular, we prove a version of the dynamical Manin-Mumford…

Dynamical Systems · Mathematics 2018-11-07 Junyi Xie

The aim of this paper is to study certain properties of the weight spectral sequences of Rapoport-Zink by a specialization argument. By reducing to the case over finite fields previously treated by Deligne, we prove that the weight…

Number Theory · Mathematics 2007-05-23 Tetsushi Ito