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48 results for twisted link

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 birack is an algebraic structure with axioms derived from the twisted virtual Reidem…

2011-05-27abs ↗pdf ↗

Twisted links are a generalization of virtual links. As virtual links correspond to abstract links on orientable surfaces, twisted links correspond to abstract links on (possibly non-orientable) surfaces. In this paper, we introduce the notion of the double covering of a twisted link. It is defined by considering the o…

2015-10-11abs ↗pdf ↗

Twisted links are obtained from a base link by starting with a nn-braid representation, choosing several (mm) adjacent strands, and applying one or more twists to the set. Various restrictions may be applied, e.g. the twists may be required to be positive or full twists, or the base braid may be required to have a ce…

2011-08-07abs ↗pdf ↗

Study on singular twisted links and virtual braids, extending knot theory concepts.

problem Extending knot theory concepts to singular twisted links and virtual braids.
method Definition and analysis of singular twisted virtual braids and their monoid structure.
result Presentation of monoid and reduced monoid for singular twisted virtual braids.

It follows from earlier work of Silver-Williams and the authors that twisted Alexander polynomials detect the unknot and the Hopf link. We now show that twisted Alexander polynomials also detect the trefoil and the figure-8 knot, that twisted Alexander polynomials detect whether a link is split and that twisted Alexand…

2013-06-14abs ↗pdf ↗

Efficient method for computing twisted Alexander polynomials of Montesinos links.

problem Computing twisted Alexander polynomials for Montesinos links efficiently.
method Developed an efficient method to compute the twisted Alexander polynomial for Montesinos links using any linear representation.
result Formulas for multi-variable Alexander polynomials can be easily derived.

Twisted torus knots and links are given by twisting adjacent strands of a torus link. They are geometrically simple and contain many examples of the smallest volume hyperbolic knots. Many are also Lorenz links. We study the geometry of twisted torus links and related generalizations. We determine upper bounds on their …

2010-07-17abs ↗pdf ↗

We show that for a large class of hyperbolic knots and links, we can determine bounds on the volume of the link complement from combinatorial information given by a link diagram. Specifically, there is a universal constant C such that if a knot or link admits a prime, twist reduced diagram with at least 2 twist regions…

2006-04-21abs ↗pdf ↗

New measure shows how links can be untangled as twists increase.

problem Understanding how links can be simplified through repeated twists.
method Introduced the stable unknotting number to analyze links in a twist family.
result The stable unknotting number depends only on the winding number of the link, not the wrapping number.

Twisted torus links are given by twisting a subset of strands on a closed braid representative of a torus link. T--links are a natural generalization, given by repeated positive twisting. We establish a one-to-one correspondence between positive braid representatives of Lorenz links and T--links, so Lorenz links and T-…

2007-07-30abs ↗pdf ↗

Study Alexander matrices for link quandles and their relation to knot invariants.

problem Understanding Alexander matrices for link quandles and their applications to knot invariants.
method Investigate ff-twisted Alexander matrices and their connection to quandle cocycle invariants.
result Show that ff-twisted Alexander invariants of knot quandles are stronger than those of knot groups.

We show that if a split link is obtained from a split link LL in S3S^3 by 1/n1/n-Dehn surgery along a trivial knot CC, then the link LCL\cup C is splittable. That is to say, it is impossible to obtain a split link from a split link via a non-trivial twisting. As its corollary, we completely determine when a trivial li…

2001-04-24abs ↗pdf ↗

We show that if a knot admits a prime, twist-reduced diagram with at least 4 twist regions and at least 6 crossings per twist region, then every non-trivial Dehn filling of that knot is hyperbolike. A similar statement holds for links. We prove this using two arguments, one geometric and one combinatorial. The combinat…

2004-12-15abs ↗pdf ↗

Bounding twist number of surface links using polynomial coefficients.

problem Bounding the twist number of alternating surface links.
method Introducing a generalized homological Kauffman bracket and applying it to surface link diagrams.
result A bound for the twist number of alternating surface links in terms of polynomial coefficients.

We consider knots whose diagrams have a high amount of twisting of multiple strands. By encircling twists on multiple strands with unknotted curves, we obtain a link called a generalized augmented link. Dehn filling this link gives the original knot. We classify those generalized augmented links that are Seifert fibere…

2009-06-24abs ↗pdf ↗

Defines and calculates signature invariants for twisted linking forms.

problem Studying twisted linking forms of knots and three-manifolds.
method Describes how to define and calculate signature invariants associated to a linking form MimesMoF(t)/F[t±1]M imes M o\mathbb{F}(t)/\mathbb{F}[t^{\pm1}] for F=R,C\mathbb{F}=\mathbb{R},\mathbb{C}, where MM is a torsion F[t±1]\mathbb{F}[t^{\pm 1}]-module.
result Classifies such linking forms up to isometry and Witt equivalence and studies their representability by matrices.

If the twist numbers of a collection of oriented alternating link diagrams are bounded, then the Alexander polynomials of the corresponding links have bounded euclidean Mahler measure (see Definition 1.2). The converse assertion does not hold. Similarly, if a collection of oriented link diagrams, not necessarily altern…

2004-12-28abs ↗pdf ↗

We show that if {L_n} is any infinite sequence of links with twist number tau(L_n) and with cyclotomic Jones polynomials of increasing span, then lim sup tau(L_n)=infty. This implies that any infinite sequence of prime alternating links with cyclotomic Jones polynomials must have unbounded hyperbolic volume. The main t…

2006-05-23abs ↗pdf ↗