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We prove that, for $n\geq 3$, the minimal dimension of a model of the classifying space of the full braid group $B_n$, and of the pure braid group $P_n$, with respect to the family of virtually cyclic groups is $n$.

Algebraic Topology · Mathematics 2018-02-12 Ramón Flores , Juan González-Meneses

The $d$-fold ($d \geq 3$) branched coverings on a disk give an infinite family of nongeometric embeddings of braid groups into mapping class groups. We, in this paper, give new explicit expressions of these braid group representations into…

Geometric Topology · Mathematics 2020-03-06 Wonjun Chang , Byung Chun Kim , Yongjn Song

In this paper, we give a geometric interpretation of virtual knotoids as arcs in thickened surfaces. Then we show that virtual knotoid theory is a generalization of classical knotoid theory. This gives a proof of a conjecture of Kauffman…

Geometric Topology · Mathematics 2026-03-05 Neslihan Gügümcü , Hamdi Kayaslan

Braid groups are an important and flexible tool used in several areas of science, such as Knot Theory (Alexander's theorem), Mathematical Physics (Yang-Baxter's equation) and Algebraic Geometry (monodromy invariants). In this note we will…

Algebraic Geometry · Mathematics 2019-05-10 Francesco Polizzi

Virtual knot theory, introduced by Kauffman, is a generalization of classical knot theory of interest because its finite-type invariant theory is potentially a topological interpretation of Etingof and Kazhdan's theory of quantization of…

Geometric Topology · Mathematics 2012-09-21 Karene Chu

Matrix transposition induces an involution on the isomorphism classes of semi-simple n-dimensional representations of the three string braid group. We show that a connected component of this variety can detect braid-reversion or that the…

Rings and Algebras · Mathematics 2011-02-22 Lieven Le Bruyn

A linear Gr-category is a category of finite-dimensional vector spaces graded by a finite group together with natural tensor product. We classify the braided monoidal structures of a class of linear Gr-categories via explicit computations…

Quantum Algebra · Mathematics 2014-05-19 Hua-Lin Huang , Gongxiang Liu , Yu Ye

We take the fundamental group of the complement of the branch curve of a generic projection induced from canonical embedding of a surface. This group is stable on connected components of moduli spaces of surfaces. Since for many classes of…

Algebraic Geometry · Mathematics 2007-05-23 Mina Teicher

In 2015 Hikami and Inoue constructed a representation of the braid group in terms of cluster algebra associated with the decomposition of the complement of the corresponding knot into ideal hyperbolic tetrahedra. This representation leads…

Geometric Topology · Mathematics 2024-08-26 Andrey Egorov

In a previous paper, we introduce and study formal manifolds, which generalize smooth manifolds. In this paper, we establish the basic theory of formal Lie groups, which are group objects in the category of formal manifolds. In particular,…

Representation Theory · Mathematics 2026-04-29 Fulin Chen , Binyong Sun , Chuyun Wang

We define invariants of braids rather than invariants of conjugacy classes of braids. For any pure three-braid we give effective upper and lower bounds for these invariants. This is done in terms of a natural syllable decomposition of the…

Geometric Topology · Mathematics 2023-12-20 Burlind Joricke

We characterize the groups of branched twist spins of classical knots in terms of 3-manifold groups, and also give a purely algebraic, conjectural characterization in terms of $PD_3$-groups. We show also that each group is the group of at…

Geometric Topology · Mathematics 2023-05-19 Jonathan A. Hillman

Let g and n be integers at least two, and let G be the pure braid group with n strands on a closed orientable surface of genus g. We describe any injective homomorphism from a finite index subgroup of G into G. As a consequence, we show…

Group Theory · Mathematics 2013-12-24 Yoshikata Kida , Saeko Yamagata

Braids groups provide an alternative to number theoretic public cryptography and can be implemented quite efficiently. The paper proposes five signature schemes: Proxy Signature, Designated Verifier, Bi-Designated Verifier, Designated…

Cryptography and Security · Computer Science 2009-09-30 Sunder Lal , Vandani Verma

Burau representation of the Artin braid group remains as one of the very important representations for the braid group. Partly, because of its connections to the Alexander polynomial which is one of the first and most useful invariants for…

Geometric Topology · Mathematics 2022-01-28 Arash Pourkia

A group-theoretical method, via Wada's representations, is presented to distinguish Kishino's virtual knot from the unknot. Biquandles are constructed for any group using Wada's braid group representations. Cocycle invariants for these…

Geometric Topology · Mathematics 2007-05-23 J. Scott Carter , Mohamed Elhamdadi , Masahico Saito , Daniel S. Silver , Susan G. Williams

Let B_n be the braid group on n > 3 strands. We prove that B_n modulo its center is co-Hopfian. We then show that any injective endomorphism of B_n is geometric in the sense that it is induced by a homeomorphism of a punctured disk. We…

Geometric Topology · Mathematics 2007-05-23 Robert W. Bell , Dan Margalit

We introduce a recoupling theory for virtual braided trees. This recoupling theory can be utilized to incorporate swap gates into anyonic models of quantum computation.

Quantum Physics · Physics 2009-09-12 H. A. Dye , Louis H. Kauffman

We introduce and study symmetric and exterior algebras in braided monoidal categories such as the category O for quantum groups. We relate our braided symmetric algebras and braided exterior algebas with their classical counterparts.

Quantum Algebra · Mathematics 2007-10-29 Arkady Berenstein , Sebastian Zwicknagl

We construct a braided version of Thompson's group V.

Group Theory · Mathematics 2013-09-04 Matthew G. Brin