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We show that quasiconformal maps on many Carnot groups must be biLipschitz. In particular, this is the case for 2-step Carnot groups with reducible first layer. These results have implications for the rigidity of quasiisometries between…

Complex Variables · Mathematics 2016-06-15 Xiangdong Xie

We study linear actions of finite groups in small dimensions, up to equivariant birationality.

Algebraic Geometry · Mathematics 2023-02-07 Yuri Tschinkel , Kaiqi Yang , Zhijia Zhang

We prove the main result that a groupoid of order n is an idempotent k-translatable quasigroup if and only if its multiplication is given by x.y = (ax+by)(mod n), where a+b = 1(mod n), a+bk = 0(mod n) and (k,n)= 1. We describe the structure…

Rings and Algebras · Mathematics 2018-10-11 Wieslaw A. Dudek , Robert A. R. Monzo

We find all the possible torsion groups of $\Q$-curves over quadratic fields and determine which groups appear finitely and which appear infinitely often.

Number Theory · Mathematics 2019-03-04 Samuel Le Fourn , Filip Najman

For a certain class of Lie bialgebras $(A,A^*)$ the corresponding quantum universal enveloping algebras $U_q(A)$ are prooved to be equivalent to quantum groups Fun$_q(F^*)$, $F^*$ being the factor group for the dual group $G^*$. This…

High Energy Physics - Theory · Physics 2008-02-03 V. D. Lyakhovsky

We present a bicovariant differential calculus on the quantum Poincare group in two dimensions. Gravity theories on quantum groups are discussed.

High Energy Physics - Theory · Physics 2009-10-22 Leonardo Castellani

We study {\em right-invariant (resp., left-invariant) Poisson quasi-Nijenhuis structures} on a Lie group $G$ and introduce their infinitesimal counterpart, the so-called {\em r-qn structures} on the corresponding Lie algebra $\mathfrak g$.…

Mathematical Physics · Physics 2019-05-31 Ghorbanali Haghighatdoost , Zohreh Ravanpak , Adel Rezaei-Aghdam

A brief review of the construction and classifiaction of the bicovariant differential calculi on quantum groups is given.

High Energy Physics - Theory · Physics 2007-05-23 B. Jurco

The general expression for the bicovariant bracket for odd generators of the external algebra on a Poisson-Lie group is given. It is shown that the graded Poisson-Lie structures derived before for $GL(N)$ and $SL(N)$ are the special cases…

High Energy Physics - Theory · Physics 2009-10-28 G. E. Arutyunov , P. B. Medvedev

Beginning with a skew-symmetric matrix, we define a certain Poisson--Lie group. Its Poisson bracket can be viewed as a cocycle perturbation of the linear (or "Lie-Poisson") Poisson bracket. By analyzing this Poisson structure, we gather…

Operator Algebras · Mathematics 2015-05-28 Byung-Jay Kahng

We compute the group of Morita self-equivalences (the Picard group) of a Poisson structure on an orientable surface, under the assumption that the degeneracies of the Poisson tensor are linear. The answer involves mapping class groups of…

Symplectic Geometry · Mathematics 2007-05-23 Olga Radko , Dimitri Shlyakhtenko

We provide an equivariant extension of the bivariant Cuntz semigroup introduced in previous work for the case of compact group actions over C*-algebras. Its functoriality properties are explored and some well-known classification results…

Operator Algebras · Mathematics 2016-07-11 Gabriele N. Tornetta

We consider the dual space of linear groups over Dynkinian and Euclidean algebras, i.e. finite dimensional algebras derived equivalent to the path algebra of Dynkin or Euclidean quiver. We prove that this space contains an open dense subset…

Representation Theory · Mathematics 2015-01-27 Viktor Bekkert , Yuriy Drozd , Vyacheslav Futorny

We show that $L_{\infty}$-algebroids, understood in terms of Q-manifolds can be described in terms of certain higher Schouten and Poisson structures on graded (super)manifolds. This generalises known constructions for Lie (super)algebras…

Mathematical Physics · Physics 2011-09-13 Andrew James Bruce

We describe the classification of ranked definably quasi-Frobenius groups of odd type : dihedral configurations are isomorphic to PGL(2, K) for K an algebraically closed field of characteristic other than two; Frobenius groups are spilt and…

Group Theory · Mathematics 2025-06-19 Samuel Zamour

In this paper, the theory to construct quantum lines for general dual quasi-bialgebras is developed followed by some specific examples where the dual quasi-bialgebras are pointed with cyclic group of points.

Quantum Algebra · Mathematics 2013-12-10 Alessandro Ardizzoni , Margaret Beattie , Claudia Menini

All bialgebra structures on twodimensional Galilei algebra are classified. The corresponding Lie-Poisson structures on Galilei group are found.

q-alg · Mathematics 2008-02-03 Emil Kowalczyk

We recall the notion of Hopf quasigroups introduced previously. We construct a bicrossproduct Hopf quasigroup $kM\bicross k(G)$ from every group $X$ with a finite subgroup $G\subset X$ and IP quasigroup transversal $M\subset X$ subject to…

Quantum Algebra · Mathematics 2009-11-17 J. Klim , S. Majid

In this paper we generalize to bivariate polynomials of Fibonacci and Lucas, properties obtained for Chebyshev polynomials. We prove that the coordinates of the bivariate polynomials over appropriate basis are families of integers…

Number Theory · Mathematics 2007-10-09 Hacéne Belbachir , Farid Bencherif

We study equivariant birationality from the perspective of derived categories. We produce examples of nonlinearizable but stably linearizable actions of finite groups on smooth cubic fourfolds.

Algebraic Geometry · Mathematics 2023-04-19 Christian Böhning , Hans-Christian Graf von Bothmer , Yuri Tschinkel