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We classify Nichols algebras of irreducible Yetter-Drinfeld modules over groups such that the underlying rack is braided and the homogeneous component of degree three of the Nichols algebra satisfies a given inequality. This assumption…

Quantum Algebra · Mathematics 2012-03-07 I. Heckenberger , A. Lochmann , L. Vendramin

We consider group-subgroup pairs in which the group is a semidirect product and the subgroup is contained in the normal part. We give conditions for the pair to be a Hecke pair and we show that the enveloping Hecke algebra and Hecke…

Operator Algebras · Mathematics 2007-05-23 Marcelo Laca , Nadia S. Larsen

Generalized double affine Hecke algebras (GDAHA) are flat deformations of the group algebras of $2$-dimensional crystallographic groups associated to star-shaped simply laced affine Dynkin diagrams. In this paper, we first construct a…

Quantum Algebra · Mathematics 2024-07-04 Davide Dal Martello , Marta Mazzocco

We study the geometry of the stratification induced by an affine hyperplane arrangement H on the quotient of a complex affine space by the action of a discrete group preserving H. We give conditions ensuring normality or normality in…

Representation Theory · Mathematics 2019-11-18 Giovanna Carnovale , Francesco Esposito

The variety of skew braces contains several interesting subcategories as subvarieties, as for instance the varieties of radical rings, of groups and of abelian groups. In this article the methods of non-abelian homological algebra are…

Quantum Algebra · Mathematics 2025-09-22 M. Gran , T. Letourmy , L. Vendramin

In the previous paper "Symmetric Crystals and Affine Hecke Algebras of Type B", we formulated a conjecture on the relations between certain classes of irreducible representations of affine Hecke algebras of type B and symmetric crystals for…

Representation Theory · Mathematics 2007-05-29 Naoya Enomoto , Masaki Kashiwara

In this paper, we will develop a family of braid representations of Artin groups of type B from braided vector spaces, and identify the homology of these groups with these coefficients with the cohomology of a specific bimodule over a…

Algebraic Topology · Mathematics 2024-02-20 Anh Trong Nam Hoang

We build representations of the elliptic braid group from the data of a quantum D-module M over a ribbon Hopf algebra U. The construction is modelled on, and generalizes, similar constructions by Lyubashenko and Majid, and also certain…

Quantum Algebra · Mathematics 2010-03-23 David Jordan

For manifolds $\cal M$ of noncompact type endowed with an affine connection (for example, the Levi-Civita connection) and a closed 2-form (magnetic field) we define a Hilbert algebra structure in the space $L^2(T^*\cal M)$ and construct an…

Quantum Physics · Physics 2009-11-11 M. V. Karasev , T. A. Osborn

This paper introduces calibrated representations for affine Hecke algebras and classifies and constructs all finite dimensional irreducible calibrated representations. The primary technique is to provide indexing sets for controlling the…

Representation Theory · Mathematics 2007-05-23 Arun Ram

We show that there is an associative algebra $\widetilde{H}_n$ such that, over a base ring $R$ of characteristic 2, Khovanov's arc algebra $H_n$ is isomorphic to the algebra $\widetilde{H}_n[x]/(x^2)$. We also show a similar result for…

Geometric Topology · Mathematics 2025-01-15 Jesse Cohen

We establish a q-generalization of Gordon's theorem that the space of diagonal coinvariants has a quotient identified with a perfect representation of the rational double affine Hecke algebra. It leads to a simple proof of his theorem and…

Quantum Algebra · Mathematics 2007-05-23 Ivan Cherednik

In this paper we introduce new affine algebraic varieties whose points correspond to associative algebras. We show that the algebras within a variety share many important homological properties. In particular, any two algebras in the same…

Representation Theory · Mathematics 2019-11-13 Edward L. Green , Lutz Hille , Sibylle Schroll

We prove a characterization of profinite algebras, i.e., topological algebras that are isomorphic to a projective limit of finite discrete algebras. In general profiniteness concerns both the topological and algebraic characteristics of a…

Logic · Mathematics 2020-08-25 Friedrich Martin Schneider , Jens Zumbrägel

Knot theory is an active field of mathematics, in which combinatorial and computational methods play an important role. One side of computational knot theory, that has gained interest in recent years, both for complexity analysis and…

Computational Geometry · Computer Science 2025-12-09 Clément Maria , Hoel Queffelec

We define the degenerate two boundary affine Hecke-Clifford algebra $\mathcal{H}_d$, and show it admits a well-defined $\mathfrak{q}(n)$-linear action on the tensor space $M\otimes N\otimes V^{\otimes d}$, where $V$ is the natural module…

Representation Theory · Mathematics 2020-04-14 Jieru Zhu

We classify tame block algebras of Hecke algebras of classical type over an algebraically closed field of odd characteristic.

Representation Theory · Mathematics 2023-06-22 Susumu Ariki

The meridian maps of the full Homfly skein of the annulus are linear endomorphisms induced by the insertion of a meridian loop, with either orientation, around a diagram in the annulus. The eigenvalues of the meridian maps are known to be…

Geometric Topology · Mathematics 2009-04-03 Richard J. Hadji , Hugh R. Morton

We show that the inclusion of an affine Hecke algebra in its Schwartz completion induces an isomorphism on periodic cyclic homology.

K-Theory and Homology · Mathematics 2007-05-23 Maarten Solleveld

We associate a monoidal category $\mathcal{H}_B$, defined in terms of planar diagrams, to any graded Frobenius superalgebra $B$. This category acts naturally on modules over the wreath product algebras associated to $B$. To $B$ we also…

Representation Theory · Mathematics 2017-07-04 Daniele Rosso , Alistair Savage