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We consider recollements of derived categories of dg-algebras induced by self orthogonal compact objects obtaining a generalization of Rickard's Theorem. Specializing to the case of partial tilting modules over a ring, we extend the results…

Rings and Algebras · Mathematics 2013-01-08 Silvana Bazzoni , Alice Pavarin

To a B-coring and a (B,A)-bimodule that is finitely generated and projective as a right A-module an A-coring is associated. This new coring is termed a base ring extension of a coring by a module. We study how the properties of a bimodule…

Rings and Algebras · Mathematics 2016-09-07 Tomasz Brzezinski , L El Kaoutit , J Gomez-Torrecillas

We give a summary (without proofs) of the main results in the author's thesis entitled ``Construction of biclosed categories'' (University of New South Wales, Australia, 1970). This summary is reprinted directly from Report 81-0030 of the…

Category Theory · Mathematics 2007-05-25 Brian J. Day

Consider a coring with exact rational functor, and a finitely generated and projective right comodule. We construct a functor (\emph{coinduction functor}) which is right adjoint to the hom-functor represented by this comodule. Using the…

Rings and Algebras · Mathematics 2009-02-13 L. El Kaoutit , J. Gómez-Torrecillas

It is well known that rings are the objects of a bicategory, whose arrows are bimodules, composed through the bimodule tensor product. We give an analogous bicategorical description of C*-algebras, von Neumann algebras, Lie groupoids,…

Mathematical Physics · Physics 2007-05-23 N. P. Landsman

The theory of bisets has been very useful in progress towards settling the longstanding question of determining units for the Burnside ring. In 2006 Bouc used bisets to settle the question for $p$-groups. In this paper, we provide a…

Representation Theory · Mathematics 2018-07-30 Jamison Barsotti

We show that the category of partial modules over a Hopf algebra $H$ is a biactegory (a bimodule category) over the category of global $H$-modules. The corresponding enrichment of partial modules over global modules is described, and the…

Rings and Algebras · Mathematics 2025-06-24 Eliezer Batista , William Hautekiet , Joost Vercruysse

We introduce the notion of a severe right Ore set in the main as a tool to study universal localisations of rings but also to provide a short proof of P. M. Cohn's classification of homomorphisms from a ring to a division ring. We prove…

Rings and Algebras · Mathematics 2007-08-03 Aidan Schofield

We explain a derived version of the basic construction of localisations of module categories by means of idempotent ideals, which lie at the heart of Faltings' almost ring theory. We use it to provide an example of a commutative algebra in…

Commutative Algebra · Mathematics 2025-10-28 Fabian Hebestreit , Peter Scholze

We define a bicategory $\mathbf{2TDX}$ whose 1-cells provide a categorification of transducers, computational devices extending finite-state automata with output capabilities. This bicategory is a mathematically interesting object: its…

Category Theory · Mathematics 2025-09-11 Fosco Loregian

For a weak 2-group, we construct a bicategory of flat 2-group bundles over differentiable stacks as a localization of a functor bicategory. This description is amenable to explicit geometric constructions. For example, we show that flat…

Algebraic Topology · Mathematics 2025-10-16 Daniel Berwick-Evans , Emily Cliff , Laura Murray , Apurva Nakade , Emma Phillips

Given a finite-dimensional real inner product space V and a finite subgroup G of linear isometries, max filtering affords a bilipschitz Euclidean embedding of the orbit space V/G. We identify the max filtering maps of minimum distortion in…

Optimization and Control · Mathematics 2022-12-13 Dustin G. Mixon , Daniel Packer

We study the Duflot filtration on the Borel equivariant cohomology of smooth manifolds with a smooth $p$-torus action. We axiomatize the filtration and prove analog of several structural results about equivariant cohomology rings in this…

Algebraic Topology · Mathematics 2018-10-18 James C. Cameron

We show that the endomorphism ring of the projective generator in the category of Soergel modules (for dihedral groups) is Koszul self-dual.

Representation Theory · Mathematics 2017-12-21 Marc Sauerwein

In this paper, we introduce the notion of binomial edge ideals of a clutter and obtain results similar to those obtained for graphs by Rauf \& Rinaldo in \cite{raufrin}. We also answer a question posed in their paper.

Commutative Algebra · Mathematics 2021-05-03 Kamalesh Saha , Indranath Sengupta

In this paper we study the behaviour of modules over finite dimensional algebras whose endomorphism algebra is a division ring. We show that there are finitely many such modules in the module category of an algebra if and only if the length…

Representation Theory · Mathematics 2020-06-09 Sibylle Schroll , Hipolito Treffinger

A description of the endomorphisms of semidirect products of two groups as a group of $2\times 2$ matrices of maps is already known. Using this description, we have studied the concept of determinant for the endomorphisms of semidirect…

Group Theory · Mathematics 2025-07-25 Ratan Lal , Alka Choudhary , Vipul Kakkar

For a standard graded algebra $R$, we consider embeddings of the the poset of Hilbert functions of quotients of $R$ into the poset of ideals of $R$, as a way of classification of Hilbert functions. There are examples of rings for which such…

Commutative Algebra · Mathematics 2012-08-09 Giulio Caviglia , Manoj Kummini

We use minimal tilting complexes to construct an explicit bijection between the set of thick tensor ideals with the two-out-of-three property in the category of finite-dimensional modules over a quantum group at a root of unity and the set…

Representation Theory · Mathematics 2022-11-21 Jonathan Gruber

For the cyclic group $C_2$ we give a complete description of the derived category of perfect complexes of modules over the constant Mackey ring $\underline{\mathbb{Z}/\ell}$, for $\ell$ a prime. This is fairly simple for $\ell$ odd, but for…

Algebraic Topology · Mathematics 2023-07-03 Daniel Dugger , Christy Hazel , Clover May