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Virtual knot theory is a generalization of knot theory which is based on Gauss chord diagrams and link diagrams on closed oriented surfaces. A twisted knot is a generalization of a virtual knot, which corresponds to a link diagram on a…

Geometric Topology · Mathematics 2015-12-04 Naoko Kamada

In the present paper the representation of the virtual braid group $VB_n$ into the automorphism group of free product of the free group and free abelian group is constructed. This representation generalizes the previously constructed ones.…

Algebraic Topology · Mathematics 2016-03-07 V. G. Bardakov , Yu. A. Mikhalchishina , M. V. Neshchadim

Almost a decade ago Vaughan Jones introduced a method to produce knots from elements of the Thompson groups $F$, which was later extended to the Brown-Thompson group $F_3$. In this article we define a way to produce permutations out of…

Geometric Topology · Mathematics 2022-12-27 Valeriano Aiello , Stefano Iovieno

This paper discusses a generalization of virtual knot theory that we call multi-virtual knot theory. Multi-virtual knot theory uses a multiplicity of types of virtual crossings. As we will explain, this multiplicity is motivated by the way…

Geometric Topology · Mathematics 2026-03-17 Louis H Kauffman

Virtual knot theory is a generalization (discovered by the author in 1996) of knot theory to the study of all oriented Gauss codes. (Classical knot theory is a study of planar Gauss codes.) Graph theory studies non-planar graphs via…

Geometric Topology · Mathematics 2007-05-23 Louis H. Kauffman

In the paper of Yu. A. Mikhalchishina for an arbitrary virtual link $L$ three groups $G_{1,r}(L)$, $r>0$, $G_{2}(L)$ and $G_{3}(L)$ were defined. In the present paper these groups for the virtual trefoil are investigated. The structure of…

Geometric Topology · Mathematics 2018-04-18 V. G. Bardakov , Yu. A. Mikhalchishina , M. V. Neshchadim

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

Given a group endowed with a Z/2-valued morphism we associate a Gauss diagram theory, and show that for a particular choice of the group these diagrams encode faithfully virtual knots on a given arbitrary surface. This theory contains all…

Geometric Topology · Mathematics 2014-03-17 Arnaud Mortier

The concepts of twisted knot theory and singular knot theory inspire the introduction of singular twisted knot theory. This study showcases similar findings for singular twisted links, including the Alexander theorem and the Markov theorem…

Geometric Topology · Mathematics 2024-03-27 Komal Negi , Madeti Prabhakar

We construct explicitly the Khovanov homology theory for virtual links with arbitrary coefficients by using the twisted coefficients method. This method also works for constructing Khovanov homology for ``non-oriented virtual knots'' in the…

Geometric Topology · Mathematics 2007-05-23 Vassily Olegovich Manturov

The motivation for this work is to construct a map from classical knots to virtual ones. What we get in the paper is a series of maps from knots in the full torus (thickened torus) to flat-virtual knots. We give definition of flat-virtual…

Geometric Topology · Mathematics 2024-06-21 V. O. Manturov , I. M. Nikonov

Cobordism of virtual string links on $n$ strands is a combinatorial generalization of link cobordism. There exists a bijection between virtual string links up to cobordisms and elements of the group $\mathbb{Z}^{n(n-1)}$. This paper also…

Geometric Topology · Mathematics 2019-02-26 Robin Gaudreau

We consider the group of unrestricted virtual braids, describe its structure and explore its relations with fused links. Also, we define the groups of flat virtual braids and virtual Gauss braids and study some of their properties, in…

Geometric Topology · Mathematics 2016-03-04 Valeriy Bardakov , Paolo Bellingeri , Celeste Damiani

In this paper, we define the notion of a virtually symmetric representation of representations of virtual braid groups and prove that many known representations are equivalent to virtually symmetric. Using one such representation, we define…

Geometric Topology · Mathematics 2021-12-13 Valeriy G. Bardakov , Mikhail V. Neshchadim , Manpreet Singh

We study groups of some virtual knots with small number of crossings and prove that there is a virtual knot with long lower central series which, in particular, implies that there is a virtual knot with residually nilpotent group. This…

Geometric Topology · Mathematics 2020-07-21 Valeriy G. Bardakov , Neha Nanda , Mikhail V. Neshchadim

In the quest in constructing conformal field theories (CFT) Jones has discovered a beautiful and deep connection between CFT, Richard Thompson's groups and knot theory. This led to a powerful functorial framework for constructing actions of…

Group Theory · Mathematics 2021-12-03 Arnaud Brothier

A virtual link can be understood as a link in a trivial I-bundle over an orientable compact surface with genus. A twisted virtual link is a link in a trivial I-bundle over a not-necessarily orientable compact surface. A twisted virtual…

Geometric Topology · Mathematics 2012-12-03 Jessica Ceniceros , Sam Nelson

We define half grid diagrams and prove every link is half grid presentable by constructing a canonical half grid pair (which gives rise to a grid diagram of some special type) associated with an element in the oriented Thompson group. We…

Geometric Topology · Mathematics 2024-08-21 Yangxiao Luo , Shunyu Wan

In 2017, Jones studied the unitary representations of Thompson's group $F$ and defined a method to construct knots and links from $F$. One of his results is that any knot or link can be obtained from an element of this group, which is…

Geometric Topology · Mathematics 2023-06-26 Yuya Kodama , Akihiro Takano

A virtual string can be defined as an equivalence class of planar diagrams under certain kinds of diagrammatic moves. Virtual strings are related to virtual knots in that a simple operation on a virtual knot diagram produces a diagram for a…

Geometric Topology · Mathematics 2009-09-29 Andrew Gibson