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We study simple, knotted and linked torus windings that are made of tubes of finite thickness. Knots which have the shortest rope length are often denoted ideal structures. Conventionally, the ideal structure are found by rope shortening…

General Physics · Physics 2015-06-16 Kasper W Olsen , Jakob Bohr

We calculate the twisted Reidemeister torsion of the complement of an iterated torus knot associated with a representation of its fundamental group to the complex special linear group of degree two. We also show that the twisted…

Geometric Topology · Mathematics 2016-02-16 Hitoshi Murakami

We classify 3-braid knots whose topological 4-genus coincides with their Seifert genus, using McCoy's twisting method and the Xu normal form. In addition, we give upper bounds for the topological 4-genus of positive and strongly…

Geometric Topology · Mathematics 2024-03-29 Sebastian Baader , Lukas Lewark , Filip Misev , Paula Truöl

We show that the problem of recognizing that a knot diagram represents a specific torus knot, or any torus knot at all, is in the complexity class ${\sf NP} \cap {\sf co\text{-}NP}$, assuming the generalized Riemann hypothesis. We also show…

Geometric Topology · Mathematics 2019-03-08 John A. Baldwin , Steven Sivek

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…

Geometric Topology · Mathematics 2009-06-26 Jessica S. Purcell

Among the knots that are the connected sum of two torus knots with cobordism distance 1, we characterize those that have 4-dimensional clasp number at least 2, and we show that their n-fold connected self-sum has 4-dimensional clasp number…

Geometric Topology · Mathematics 2021-08-27 Peter Feller , JungHwan Park

We list more than 200 new examples of minor minimal intrinsically knotted graphs and describe many more that are intrinsically knotted and likely minor minimal.

Geometric Topology · Mathematics 2015-03-13 Noam Goldberg , Thomas W. Mattman , Ramin Naimi

We determine the set of all genus g bridge numbers of many iterated torus knots, listing these numbers in a sequence called the bridge spectrum. In addition, we prove a structural lemma about the decomposition of a strongly irreducible…

Geometric Topology · Mathematics 2013-02-01 Alexander Zupan

Take a thin, rectangular strip of paper, add in an odd number of half-twists, then join the ends together. This gives a multi-twist paper M\"obius band. We prove that any multi-twist paper M\"obius band can be constructed so the aspect…

Geometric Topology · Mathematics 2025-10-29 Elizabeth Denne , Timi Patterson

Torus knots are an important family of knots about which much is understood; invariants of torus knots often exhibit nice formulas, making them convenient and fundamental building blocks for examples in knot theory. Spiral knots, defined…

Geometric Topology · Mathematics 2025-06-24 Sarah Blackwell , Ashish Das , Sydney Mayer , Luke Moyar , Faisal Quraishi , Ryan Stees

We present classification results for exceptional Legendrian realisations of torus knots. These are the first results of that kind for non-trivial topological knot types. Enumeration results of Ding-Li-Zhang concerning tight contact…

Symplectic Geometry · Mathematics 2021-01-05 Hansjörg Geiges , Sinem Onaran

We introduce a new algebraic topological technique to detect non-fibred knots in the three sphere using the twisted Alexander invariants. As an application, we show that for any Seifert matrix of a knot with a nontrivial Alexander…

Geometric Topology · Mathematics 2007-05-23 Jae Choon Cha

The A-polynomial of a knot is defined in terms of SL(2,C) representations of the knot group, and encodes information about essential surfaces in the knot complement. In 2005, Dunfield-Garoufalidis and Boyer-Zhang proved that it detects the…

Geometric Topology · Mathematics 2026-02-16 John A. Baldwin , Steven Sivek

We establish a Kauffman-Murasugi-Thistlethwaite-type theorem for alternating knots in a solid torus. Specifically, we show that any dotted-reduced alternating diagram of a knot in a handlebody realizes the minimal crossing number, and that…

Geometric Topology · Mathematics 2026-01-30 Lizzie Buchanan , Tanushree Shah

We construct an infinite family of smoothly slice knots that we prove are topologically doubly slice. Using the correction terms coming from Heegaard Floer homology, we show that none of these knots is smoothly doubly slice. We use these…

Geometric Topology · Mathematics 2017-05-17 Jeffrey Meier

Numerical simulations indicate that there exist conformations of the unknot, tied on a finite piece of rope, entangled in such a manner, that they cannot be disentangled to the torus conformation without cutting the rope. The simplest…

Computational Physics · Physics 2007-05-23 P. Pieranski , S. Przybyl , A. Stasiak

This paper exhibits an infinite family of hyperbolic knot complements that have three knot complements in their respective commensurability classes.

Geometric Topology · Mathematics 2014-10-01 Neil R. Hoffman

We calculate the asymptotic behavior of the Kashaev invariant of a twice-itarated torus knot and obtain topological interpretation of the formula in terms of the Chern--Simons invariant and the twisted Reidemeister torsion.

Geometric Topology · Mathematics 2019-04-09 Hitoshi Murakami , Anh T. Tran

We give a recipe for constructing families of distinct knots that have identical Khovanov homology and give examples of pairs of prime knots, as well as infinite families, with this property.

Geometric Topology · Mathematics 2014-10-01 Liam Watson

We prove for residually finite groups the following long standing conjecture: the number of twisted conjugacy classes of an automorphism of a finitely generated group is equal (if it is finite) to the number of finite dimensional…

Group Theory · Mathematics 2012-05-01 Alexander Fel'shtyn , Evgenij Troitsky
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