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We construct centrally large subalgebras in crossed products of $C (X, D)$ by automorphisms in which $D$ is simple, $X$ is compact metrizable, the automorphism induces a minimal homeomorphism of $X$, and a mild technical assumption holds.…

Operator Algebras · Mathematics 2020-09-28 Dawn Archey , Julian Buck , N. Christopher Phillips

We build resolutions for general twisted tensor products of algebras. These bimodule and module resolutions unify many constructions in the literature and are suitable for computing Hochschild (co)homology and more generally Ext and Tor for…

Rings and Algebras · Mathematics 2019-04-10 A. V. Shepler , S. Witherspoon

In this paper, we first define extending datums and unified products of Rota-Baxter family Hom-associative algebras, and theoretically solve the extending structure problem. Moreover, we consider flag datums as an application, and give an…

Rings and Algebras · Mathematics 2024-12-12 Junwen Wang , Yuanyuan Zhang , Yanjun Chu

In this paper, we compute the homology group and cohomology algebra of various polyhedral product objects uniformly from the point of view of diagonal tensor product. As applications, we introduce the polyhedral product method into…

Algebraic Topology · Mathematics 2018-04-24 Qibing Zheng

Let $(H,\alpha)$ be a monoidal Hom-Hopf algebra, and $(A,\beta)$ a Hom-algebra. In this paper we will introduce the crossed product $(A\#_{\sigma}H,\beta\otimes\alpha)$, which is a Hom-algebra. Then we will introduce the notions of cleft…

Rings and Algebras · Mathematics 2019-12-30 Yan Ning , Daowei Lu

We define the twisted tensor product of two enriched categories, which generalizes various sorts of `products' of algebraic structures, including the bicrossed product of groups, the twisted tensor product of (co)algebras and the double…

Category Theory · Mathematics 2011-12-06 Aura Bârdeş , Dragoş Ştefan

The aim of this paper is to explore non-abelian extensions of Bol algebras and to study the extensibility of a pair of automorphisms within these non-abelian extensions. We begin by researching non-abelian extensions of Bol algebras and…

Rings and Algebras · Mathematics 2025-12-15 Jingzi Zhang , Tao Zhang

Over-extended Kac-Moody algebras contain so-called gradient structures - a gl(d)-covariant level decomposition of the algebra contains strings of modules at different levels that can be interpreted as spatial gradients. We present an…

High Energy Physics - Theory · Physics 2025-07-09 Martin Cederwall , Jakob Palmkvist

The notion of crossed modules for Lie 2-algebras is introduced. We show that, associated to such a crossed module, there is a strict Lie 3-algebra structure on its mapping cone complex and a strict Lie 2-algebra structure on its…

Rings and Algebras · Mathematics 2014-03-03 Honglei Lang , Zhangju Liu

In this paper we study the categories of braided categorical associative algebras and braided crossed modules of associative algebras and we relate these structures with the categories of braided categorical Lie algebras and braided crossed…

Category Theory · Mathematics 2017-11-27 Alejandro Fernández-Fariña , Manuel Ladra

We investigate criteria for algebra extensions that are of Galois type with respect to the coaction of a Hopf algebra or, more generally, a one-sided quotient of a Hopf algebra, or with respect to an entwining. We study the module- and…

Quantum Algebra · Mathematics 2007-05-23 P. Schauenburg , H. -J. Schneider

Applying a result of abstract ring theory we get that bijective additive mappings on standard algebras of unbounded operators preserving zero products are multiples of ring isomorphisms. The structure of additive bijective mappings on…

Operator Algebras · Mathematics 2007-05-23 Werner Timmermann

There is a famous multiplication table of types of tensor product of two von Neumann algebras. We filled out the multiplication table of graded tensor product of two graded von Neumann algebras in special cases.

Operator Algebras · Mathematics 2025-08-15 Jumpei Tanaka

We give a self-contained and simplified presentation of the theory of covariant representations for inverse semigroup actions on Banach algebras, which was recently introduced in the authors and A. Mckee in the twisted case. The main result…

Functional Analysis · Mathematics 2026-01-22 K. Bardadyn , B. K. Kwaśniewski

Generalizing a theorem of Macdonald, we show a formula for the mixed Hodge structure on the cohomology of the symmetric products of bounded complexes of mixed Hodge modules by showing the existence of the canonical action of the symmetric…

Algebraic Geometry · Mathematics 2012-04-03 Laurentiu Maxim , Morihiko Saito , Joerg Schuermann

It is well known that the relation-extensions of tilted algebras are cluster-tilted algebras. In this paper, we extend the result to silted algebras and prove some extension of silted algebras are cluster-tilted algebras.

Representation Theory · Mathematics 2020-05-19 Hanpeng Gao

It is well known that the cohomology of a tensor product is essentially the tensor product of the cohomologies. We look at twisted tensor products, and investigate to which extend this is still true. We give an explicit description of the…

K-Theory and Homology · Mathematics 2008-03-27 Petter Andreas Bergh , Steffen Oppermann

We introduced a braided Sweedler cohomology, which is adequate to work with the H-braided cleft extensions studied in [J. A. Guccione and J. J. Guccione, Theory of braided Hopf crossed products, Journal of Algebra, Vol 261 (2003) 54-101]

Rings and Algebras · Mathematics 2007-06-04 Sergio D. Corti , Jorge A. Guccione , Juan J. Guccione

Let $X$ be an infinite compact metric space with finite covering dimension and let $\alpha, \beta : X\to X$ be two minimal homeomorphisms. We prove that the crossed product $C^*$-algebras $C(X)\rtimes_\alpha\Z$ and $C(X)\rtimes_\belta\Z$…

Operator Algebras · Mathematics 2015-08-06 Huaxin Lin

Relationship is clarified between the notions of linear extension of algebraic theories, and central extension, in the sense of commutator calculus, of their models. Varieties of algebras turn out to be nilpotent Maltsev precisely when…

Category Theory · Mathematics 2007-05-23 Mamuka Jibladze , Teimuraz Pirashvili