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We study results related to a conjecture formulated by Strohmer and Beaver about optimal Gaussian Gabor frame set-ups. Our attention will be restricted to the case of Gabor systems with standard Gaussian window and rectangular lattices of…

Functional Analysis · Mathematics 2020-12-11 Markus Faulhuber

We prove the conjecture that higher Verlinde categories are geometrically reductive. This is one of the two properties required in order for recent results on algebraic geometry in tensor categories to apply to these categories. We also…

Representation Theory · Mathematics 2026-05-20 Kevin Coulembier

We define a new height function on rational points of a DM (Deligne-Mumford) stack over a number field. This generalizes a generalized discriminant of Ellenberg-Venkatesh, the height function recently introduced by…

Number Theory · Mathematics 2024-01-12 Ratko Darda , Takehiko Yasuda

In this paper, we confirm the Fino-Vezzoni Conjecture for unimodular Lie algebras which contain abelian ideals of codimension two, a natural generalization to the class of almost abelian Lie algebras. This provides new evidence towards the…

Differential Geometry · Mathematics 2024-07-23 Kexiang Cao , Fangyang Zheng

This paper is devoted to an intrinsic geometrical classification of three-mirror telescopes. The problem is formulated as the study of the connected components of a semi-algebraic set. Under first order approximation, we give the general…

Instrumentation and Methods for Astrophysics · Physics 2025-01-24 Audric Drogoul

For a commutative ring $R$, we exploit localization techniques and point-free topology to give an explicit realization of both the Zariski frame of $R$ (the frame of radical ideals in $R$) and its Hochster dual frame, as lattices in the…

Algebraic Geometry · Mathematics 2016-12-01 Joachim Kock , Wolfgang Pitsch

For the module category of a hereditary ring, the Ext-orthogonal pairs of subcategories are studied. For each Ext-orthogonal pair that is generated by a single module, a 5-term exact sequence is constructed. The pairs of finite type are…

Representation Theory · Mathematics 2010-08-27 Henning Krause , Jan Stovicek

Reider's Theorem on the very ampleness of adjoint linear series on a complex projective algebraic surface is extended in two new directions. First, Reider-type inequalities are shown to imply nefness of linear series of the form dH - E on…

Algebraic Geometry · Mathematics 2026-04-24 Aaron Bertram , Jonathon Fleck , Liebo Pan , Joseph Sullivan

Chu has recently shown that the Abel lemma on summations by parts can serve as the underlying relation for Bailey's ${}_6\psi_6$ bilateral summation formula. In other words, the Abel lemma spells out the telescoping nature of the…

Combinatorics · Mathematics 2007-05-23 Vincent Y. B. Chen , William Y. C. Chen , Nancy S. S. Gu

An extension of algebras is a homomorphism of algebras preserving identities. We use extensions of algebras to study the finitistic dimension conjecture over Artin algebras. Let $f: B \to A$ be an extension of Artin algebras. We denote by…

Rings and Algebras · Mathematics 2018-03-01 Shufeng Guo

Grassmann tensors arise from classical problems of scene reconstruction in computer vision. Trifocal Grassmann tensors, related to three projections from a projective space of dimension k onto view-spaces of varying dimensions are studied…

Algebraic Geometry · Mathematics 2019-07-25 Marina Bertolini , Gian Mario Besana , Gilberto Bini , Cristina Turrini

We develop some basic results about full amalgamation classes with intrinsic trascendentals. These classes have generics whose models may have finite subsets whose intrinsic closure is not contained in its algebraic closure. We will show…

Logic · Mathematics 2015-12-15 Justin Brody

We give criteria for certain morphisms from an algebraic stack to a (not necessarily algebraic) stack to admit an (appropriately defined) scheme-theoretic image. We apply our criteria to show that certain natural moduli stacks of local…

Number Theory · Mathematics 2020-10-26 Matthew Emerton , Toby Gee

We generalize Illusie's definition of the Atiyah class to complexes with quasi-coherent cohomology on arbitrary algebraic stacks. We show that this gives a global obstruction theory for moduli stacks of complexes in algebraic geometry…

Algebraic Geometry · Mathematics 2024-11-20 Nikolas Kuhn

We consider a Deligne-Mumford stack $X$ which is the quotient of an affine scheme $\operatorname{Spec}A$ by the action of a finite group $G$ and show that the Balmer spectrum of the tensor triangulated category of perfect complexes on $X$…

Algebraic Geometry · Mathematics 2022-10-06 Eike Lau

Tanisaki introduced generating sets for the defining ideals of the schematic intersections of the closure of conjugacy classes of nilpotent matrices with the set of diagonal matrices. These ideals are naturally labeled by integer…

Commutative Algebra · Mathematics 2008-03-06 Riccardo Biagioli , Sara Faridi , Mercedes Rosas

We state a conjectural criterion for identifying global integral points on a hyperbolic curve over $\mathbb{Z}$ in terms of Selmer schemes inside non-abelian cohomology functors with coefficients in $\mathbb{Q}_p$-unipotent fundamental…

Number Theory · Mathematics 2017-04-04 Jennifer Balakrishnan , Ishai Dan-Cohen , Minhyong Kim , Stefan Wewers

Tensoring with type I algebras preserves elementary equivalence in the category of tracial von Neumann algebras. The proof involves a novel and general Feferman--Vaught-type theorem for direct integrals of metric structures.

Logic · Mathematics 2024-11-27 Ilijas Farah , Saeed Ghasemi

Continuing a series of articles in the past few years on creative telescoping using reductions, we develop a new algorithm to construct minimal telescopers for algebraic functions. This algorithm is based on Trager's Hermite reduction and…

Symbolic Computation · Computer Science 2016-02-02 Shaoshi Chen , Manuel Kauers , Christoph Koutschan

Tensors are multiway arrays of data, and transverse operators are the operators that change the frame of reference. We develop the spectral theory of transverse tensor operators and apply it to problems closely related to classifying…

Spectral Theory · Mathematics 2020-05-12 Uriya First , Joshua Maglione , James B. Wilson