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We prove that the cohomology algebra of elliptic arrangements depends only on the poset of layers. In the particular case of braid elliptic arrangements, we study the cohomology as representation and we compute some Hodge numbers. Finally,…

Algebraic Topology · Mathematics 2019-01-08 Roberto Pagaria

In this article, we describe the geography of the Teichm\"uller stack of \cite{LMStacks} and of one of its variants we introduce here, giving some answers to questions as: which points are orbifold points? What are the different local…

Complex Variables · Mathematics 2024-10-25 Laurent Meersseman

The aim of this paper is to extend Gerstenhaber formal deformations of algebras to the case of Hom-Alternative and Hom-Malcev algebras. We construct deformation cohomology groups in low dimensions. Using a composition construction, we give…

Rings and Algebras · Mathematics 2010-06-15 Mohamed Elhamdadi , Abdenacer Makhlouf

We prove that the Schweitzer complex is elliptic and its cohomologies define cohomological functors. As applications, we obtain finite dimensionality, a version of Serre duality, restrictions of the behaviour of cohomology in small…

Algebraic Geometry · Mathematics 2022-04-14 Jonas Stelzig

We introduce a new cohomology theory for stacks called elliptic Hochschild homology, prove some fundamental properties and compute it in some classes of examples. We then introduce its periodic cyclic version and show that, over the complex…

Algebraic Geometry · Mathematics 2023-09-18 Nicolò Sibilla , Paolo Tomasini

In this paper, we give an explicit description of the de Rham and p-adic polylogarithms for elliptic curves using the Kronecker theta function. We prove in particular that when the elliptic curve has complex multiplication and good…

Number Theory · Mathematics 2020-09-11 Kenichi Bannai , Shinichi Kobayashi , Takeshi Tsuji

For an elliptic curve $E$ defined over the field $\mathbb{C}$ of complex numbers, we classify all translates of elliptic curves in $E^3$ such that the $x$-coordinates satisfy a linear equation. This classification enables us to establish a…

Number Theory · Mathematics 2023-10-27 Jerson Caro , Natalia Garcia-Fritz

We prove that the Gromov width of coadjoint orbits of the symplectic group is at least equal to the upper bound known from the works of Zoghi and Caviedes. This establishes the actual Gromov width. Our work relies on a toric degeneration of…

Symplectic Geometry · Mathematics 2018-04-25 Iva Halacheva , Milena Pabiniak

Toric orbifolds are a topological generalization of projective toric varieties associated to simplicial fans. We introduce some sufficient conditions on the combinatorial data associated to a toric orbifold to ensure the existence of an…

Algebraic Geometry · Mathematics 2021-06-29 Soumen Sarkar , V. Uma

In this paper we equate the analytic and the intersection Reidemeister torsions on spaces with a specific type of wedge singularities, which arise by turning the disc cross-sections in the tubular neighborhood of an embedded submanifold of…

Differential Geometry · Mathematics 2024-09-02 Luiz Hartmann , Boris Vertman

Let E be an elliptic curve defined over Q. We study the relationship between the torsion subgroup E(Q)_tors and the torsion subgroup E(K)_tors, where K is a cubic number field. In particular, We study the number of cubic number fields K…

Number Theory · Mathematics 2017-01-05 Enrique Gonzalez-Jimenez , Filip Najman , Jose M. Tornero

The goal of this paper is to refine some aspects of the cohomological study of Bruhat-Tits subgroups. It aims to complement the work done in the 1987 article. As an application, we obtain a result "\`a la Grothendieck-Serre" for Bruhat-Tits…

Group Theory · Mathematics 2025-09-23 Anis Zidani

In this paper, we study the geometry of trisections on certain rational elliptic surfaces. We utilize Mumford representations of semi-reduced divisors in order to construct trisections and related plane curves with interesting properties…

Algebraic Geometry · Mathematics 2021-03-16 S. Bannai , N. Kawana , R. Masuya , H. Tokunaga

We prove that, for semi-invertible linear cocycles, Oseledets subspaces associated to ergodic measures may be approximated by Oseledets subspaces associated to periodic points.

Dynamical Systems · Mathematics 2019-05-23 Lucas Backes

This paper studies connections between generalized moonshine and elliptic cohomology with a focus on the action of the Hecke correspondence and its implications for the notion of replicability.

Algebraic Topology · Mathematics 2015-12-08 Nora Ganter

We show that the centraliser of the maximal compact subgroup of the real orthogonal or symplectic groups acting on tensors of their standard representation are isomorphic to cyclotomic Brauer algebras. We also show that for the symplectic…

Rings and Algebras · Mathematics 2020-03-23 Kieran Calvert

In this note, we reformulate the invariant $\Delta (M, \omega)$ that we defined before, and show its relation with Reidemeister torsion. We calculate $\Delta (M, \omega)$ when the $3$-manifolds are lens spaces, and discuss the…

Geometric Topology · Mathematics 2024-11-18 Yuanyuan Bao

In this paper we completely classify symplectic actions of a torus $T$ on a compact connected symplectic manifold $(M, \sigma)$ when some, hence every, principal orbit is a coisotropic submanifold of $(M, \sigma)$. That is, we construct an…

Differential Geometry · Mathematics 2007-05-23 J. J. Duistermaat , A. Pelayo

This article uses homological methods for evaluating compactly supported cohomology groups of noncompact toric surfaces

K-Theory and Homology · Mathematics 2015-05-26 Malgorzata Aneta Marciniak

We prove a Poincar\'e-Bendixson theorem describing the asymptotic behavior of geodesics for a meromorphic connection on a compact Riemann surface. We shall also briefly discuss the case of non-compact Riemann surfaces, and study in detail…

Complex Variables · Mathematics 2014-06-27 Marco Abate , Fabrizio Bianchi