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The ropelength of a knot or link is the minimal number of inches of 1-inch-thick rope that it takes to tie it. The relationship of this measurement to knot and link invariants has been studied by various authors. We give the first results…

Geometric Topology · Mathematics 2025-09-04 Rafał Komendarczyk , Robin Koytcheff , Fedor Manin

Given any unoriented link diagram, a group of new knot invariants are constructed. Each of them satisfies a generalized 4 term skein relation. The coefficients of each invariant is from a commutative ring. Homomorphisms and representations…

Geometric Topology · Mathematics 2010-04-14 Zhiqing Yang , Jifu Xiao

Link invariants, for 3-manifolds, are defined in the context of the Rozansky-Witten theory. To each knot in the link one associates a holomorphic bundle over a holomorphic symplectic manifold X. The invariants are evaluated for b_{1}(M)…

High Energy Physics - Theory · Physics 2007-05-23 George Thompson

For an $n$-component link $L$, the Milnor's isotopy invariant is defined for each multi-index $I=i_1i_2...i_m (i_j\in\n)$. Here $m$ is called the length. Let $r(I)$ denote the maximam number of times that any index appears. It is known that…

Geometric Topology · Mathematics 2007-05-23 Akira Yasuhara

We show that there are only finitely many homogeneous links whose Conway polynomial has any given degree. Using this we give an example of an inhomogeneous, fibred knot. Secondly, we show how to compute the monodromy of a homogeneous link…

Geometric Topology · Mathematics 2012-07-03 Mark Bell

We study configuration space integral formulas for Milnor's homotopy link invariants, showing that they are in correspondence with certain linear combinations of trivalent trees. Our proof is essentially a combinatorial analysis of a…

Algebraic Topology · Mathematics 2021-06-23 Robin Koytcheff , Ismar Volic

The Magnus expansion is a universal finite type invariant of pure braids with values in the space of horizontal chord diagrams. The Conway polynomial composed with the short circuit map from braids to knots gives rise to a series of finite…

Geometric Topology · Mathematics 2010-01-22 S. V. Duzhin

We generalize Milnor link invariants to all types of surface-links in $4$--space (possibly with boundary). This is achieved by using the notion of cut-diagram, which is a 2-dimensional generalization of Gauss diagrams, associated to…

Geometric Topology · Mathematics 2025-12-02 Benjamin Audoux , Jean-Baptiste Meilhan , Akira Yasuhara

We give a combinatorial treatment of transverse homology, a new invariant of transverse knots that is an extension of knot contact homology. The theory comes in several flavors, including one that is an invariant of topological knots and…

Symplectic Geometry · Mathematics 2013-05-08 Lenhard Ng

We prove that the HOMFLYPT polynomial of a link, colored by partitions with a fixed number of rows is a $q$-holonomic function. Specializing to the case of knots colored by a partition with a single row, it proves the existence of an…

Geometric Topology · Mathematics 2018-05-31 Stavros Garoufalidis , Aaron D. Lauda , Thang T. Q. Lê

In this paper, we introduce two functions such that the subtraction corresponds to the Milnor's triple linking number; the addition obtains a new integer-valued link homotopy invariant of $3$-component links. We also have found a series of…

Geometric Topology · Mathematics 2022-05-31 Noboru Ito , Natsumi Oyamaguchi

In \cite{PrzytyskiTraczyk} J.H.Przytyski and P.Traczyk introduced an algebraic structure, called {\it a Conway algebra,} and constructed an invariant of oriented links, which is a generalization of the Homflypt polynomial invariant. On the…

Geometric Topology · Mathematics 2018-04-30 Seongjeong Kim

The purpose of this paper is to present a certain combinatorial method of constructing invariants of isotopy classes of oriented tame links. This arises as a generalization of the known polynomial invariants of Conway and Jones. These…

Geometric Topology · Mathematics 2016-10-24 Jozef H. Przytycki , Pawel Traczyk

Mutant knots, in the sense of Conway, are known to share the same Homfly polynomial. Their 2-string satellites also share the same Homfly polynomial, but in general their m-string satellites can have different Homfly polynomials for m>2. We…

Geometric Topology · Mathematics 2009-03-31 H. R. Morton

We define and study a family of link invariants $\mathit{HFK}_{n}(L)$. Although these homology theories are defined using holomorphic disc counts, they share many properties with $sl_{n}$ homology. Using these theories, we give a framework…

Geometric Topology · Mathematics 2018-04-11 Nathan Dowlin

In a previous paper, the authors proved that Milnor link-homotopy invariants modulo $n$ classify classical string links up to $2n$-move and link-homotopy. As analogues to the welded case, in terms of Milnor invariants, we give here two…

Geometric Topology · Mathematics 2019-03-04 Haruko A. Miyazawa , Kodai Wada , Akira Yasuhara

We present the $CWR$ invariant, a new invariant for alternating links, which builds upon and generalizes the $WRP$ invariant. The $CWR$ invariant is an array of two-variable polynomials that provides a stronger invariant compared to the…

Geometric Topology · Mathematics 2025-05-27 Michal Jablonowski

Polynomial invariants corresponding to the fundamental representation of the gauge group $SU(N)$ are computed for arbitrary torus knots and links in the framework of Chern-Simons gauge theory making use of knot operators. As a result, a…

High Energy Physics - Theory · Physics 2011-07-19 J. M. F. Labastida , M. Mariño

We provide methods to compute the colored HOMFLY polynomials of knots and links with symmetric representations based on the linear skein theory. By using diagrammatic calculations, several formulae for the colored HOMFLY polynomials are…

Geometric Topology · Mathematics 2012-11-19 Kenichi Kawagoe

We define an integer valued invariant for two-component links in S^3 by counting projective SU(2) representations of the link group having non-trivial second Stiefel-Whitney class. We show that our invariant is, up to sign, the linking…

Geometric Topology · Mathematics 2009-11-23 Eric Harper , Nikolai Saveliev