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We define and study a new class of bialgebras, which generalize certain Turner double algebras related to generic blocks of symmetric groups. Bases and generators of these algebras are given. We investigate when the algebras are symmetric,…

Representation Theory · Mathematics 2018-10-09 Alexander Kleshchev , Robert Muth

In this article we extend the theory of the binary codes (the strict code $\mathcal{K}$ and the extended code $\mathcal{K}'$), associated to a projective nodal surface, to a coding theory for normal surfaces, with special consideration of…

Algebraic Geometry · Mathematics 2025-08-25 Fabrizio Catanese

We study Lie-Rinehart algebra structures in the framework provided by a duality pairing of modules over a unital commutative associative algebra. Thus, we construct examples of Lie brackets corresponding to a fixed anchor map whose image is…

Differential Geometry · Mathematics 2024-02-19 Daniel Beltita , Alina Dobrogowska , Grzegorz Jakimowicz

Generalizing work of Marin [12], we construct in a unified way all the "braids and ties'' algebras available in literature and new ones.

Rings and Algebras · Mathematics 2025-11-26 Riccardo Fasano , Domenico Fiorenza , Paolo Papi

We develop a new general framework for algebras and clones, called Universal Clone Algebra. Algebras and clones of finitary operations are to Universal Algebra what t-algebras and clone algebras are to Universal Clone Algebra. Clone…

Logic · Mathematics 2022-06-03 Antonino Salibra

Despite the wide variety of input types in machine learning, this diversity is often not fully reflected in their representations or model architectures, leading to inefficiencies throughout a model's lifecycle. This paper introduces an…

Machine Learning · Computer Science 2024-10-16 Stephane Bersier , Xinyi Chen-Lin

We construct an explicit isomorphism between blocks of cyclotomic Hecke algebras and (sign-modified) Khovanov-Lauda algebras in type A. These isomorphisms connect the categorification conjecture of Khovanov and Lauda to Ariki's…

Representation Theory · Mathematics 2009-10-26 Jonathan Brundan , Alexander Kleshchev

In the present paper we examine the relationship between several type $A$ cluster theories and structures. We define a 2D geometric model of a cluster theory, which generalizes cluster algebras from surfaces, and encode several existing…

Representation Theory · Mathematics 2022-01-03 Job Daisie Rock

From the viewpoint of semi-abelian homology, some recent results on homology of Leibniz n-algebras can be explained categorically. In parallel with these results, we develop an analogous theory for Lie n-algebras. We also consider the…

Algebraic Topology · Mathematics 2011-03-16 Jose Manuel Casas , Emzar Khmaladze , Manuel Ladra , Tim Van der Linden

The main goal of this work is to establish a bijection between Dyck words and a family of Eulerian digraphs. We do so by providing two algorithms implementing such bijection in both directions. The connection between Dyck words and Eulerian…

Discrete Mathematics · Computer Science 2014-07-10 Pietro Codara , Ottavio M. D'Antona , Marco Genuzio

We start from any small strict monoidal braided Ab-category and extend it to a monoidal nonstrict braided Ab-category which contains braided bialgebras. The objects of the original category turn out to be modules for these bialgebras

Algebraic Topology · Mathematics 2010-07-02 Raul A. Perez , Carlos Prieto

We present a collection of questions related to the structure and classification of nuclear C*-algebras.

Operator Algebras · Mathematics 2026-05-11 Christopher Schafhauser , Aaron Tikuisis , Stuart White

We proved in a previous article that the bar complex of an E-infinity algebra inherits a natural E-infinity algebra structure. As a consequence, a well-defined iterated bar construction B^n(A) can be associated to any algebra over an…

Algebraic Topology · Mathematics 2014-10-01 Benoit Fresse

This short course offers a new perspective on randomized algorithms for matrix computations. It explores the distinct ways in which probability can be used to design algorithms for numerical linear algebra. Each design template is…

Numerical Analysis · Mathematics 2025-09-23 Anastasia Kireeva , Joel A. Tropp

We give a construction of Kirchberg algebras from graphs. By using product graphs in the construction we are able to provide models for general (UCT) Kirchberg algebras while maintaining the explicit generators and relations of the…

Operator Algebras · Mathematics 2007-05-23 Jack Spielberg

We present solutions for the (constant and spectral-parameter) Yang-Baxter equations and Yang-Baxter systems arising from algebra structures and discuss about their symmetries. In the last section, we present some applications.

Quantum Algebra · Mathematics 2014-01-03 Florin F. Nichita , Bogdan P. Popovici

We generalize the notion of cyclic codes by using generator polynomials in (non commutative) skew polynomial rings. Since skew polynomial rings are left and right euclidean, the obtained codes share most properties of cyclic codes. Since…

Rings and Algebras · Mathematics 2016-08-16 Delphine Boucher , Willi Geiselmann , Félix Ulmer

In this paper the relationship between iterated tilted algebras and cluster-tilted algebras and relation-extensions is studied. In the Dynkin case, it is shown that the relationship is very strong and combinatorial.

Representation Theory · Mathematics 2008-11-11 Michael Barot , Elsa Fernández , María Inés Platzeck , Nilda Isabel Pratti , Sonia Trepode

We show that given a Hom-Lie algebra one can construct the n-ary Hom-Lie bracket by means of an (n-2)-cochain of given Hom-Lie algebra and find the conditions under which this n-ary bracket satisfies the Filippov-Jacobi identity, there by…

Rings and Algebras · Mathematics 2020-03-18 Abdelkader Ben Hassine , Sami Mabrouk , Othmen Ncib

In this paper we show that if two central simple $k$-algebras generate the same cyclic subgroup in $\mathrm{Br}(k)$, then there are rational maps between varieties associated to these algebras, such as Brauer--Severi varieties, norm…

Algebraic Geometry · Mathematics 2016-02-16 Saša Novaković
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