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This paper contains the first knot polynomials which can distinguish the orientations of classical knots and which make no excplicit use of the knot group. But they make extensive use of the meridian and of the longitude in a geometric way.…

Geometric Topology · Mathematics 2023-01-18 Thomas Fiedler

We call a knot in the 3-sphere $SU(2)$-simple if all representations of the fundamental group of its complement which map a meridian to a trace-free element in $SU(2)$ are binary dihedral. This is a generalisation of being a 2-bridge knot.…

Geometric Topology · Mathematics 2017-02-15 Raphael Zentner

The tail of the colored Jones polynomial of an alternating link is a $q$-series invariant whose first $n$ terms coincide with the first $n$ terms of the $n$-th colored Jones polynomial. Recently, it has been shown that the tail of the…

Geometric Topology · Mathematics 2016-05-03 Mohamed Elhamdadi , Mustafa Hajij

We compute the E-polynomial of the character variety of representations of a rank r free group in SL(3, C). Expanding upon existing techniques, we stratify the space of representations and compute the E-polynomial of each geometrically…

Algebraic Geometry · Mathematics 2016-02-25 Sean Lawton , Vicente Muñoz

We study the representation spaces $R(K;\bf{i})$ as appearing in Kronheimer and Mrowka's framed instanton knot Floer homology, for a class of pretzel knots. In particular, for pretzel knots $P(p,q,r)$ with $p, q, r$ pairwise coprime, these…

Geometric Topology · Mathematics 2014-10-01 Raphael Zentner

Let $K\subset S^3$ be a knot, $X:= S^3\setminus K$ its complement, and $\mathbb{T}$ the circle group identified with $\mathbb{R}/\mathbb{Z}$. To any oriented long knot diagram of $K$, we associate a quadratic polynomial in variables…

Geometric Topology · Mathematics 2017-04-25 Rinat Kashaev

As a generalization of the classical knots, knotoids deal with the open ended knot diagrams in a surface. In recent years, many polynomial invariants for knotoids have appeared, such as the bracket polynomial, the index polynomial and the…

Geometric Topology · Mathematics 2023-12-27 Yi Feng , Fengling Li

We give a nice description for a Zariski open subset of the ${\rm SL}(3,\mathbb{C})$-character variety of the Whitehead link.

Geometric Topology · Mathematics 2024-08-06 Haimiao Chen

We determine SL(n)-stable, SL(2)-regular subvarieties of the variety of complete quadrics. We extend the results of Aky{\i}ld{\i}z and Carrell on Kostant-Macdonald identity by computing the Poincar{\'e} polynomials of these regular…

Algebraic Geometry · Mathematics 2011-11-01 Mahir Bilen Can , Michael Joyce

We derive new obstructions to periodicity of classical knots by employing the Heegaard Floer correction terms of the finite cyclic branched covers of the knots. Applying our results to two fold covers, we demonstrate through numerous…

Geometric Topology · Mathematics 2014-09-23 Stanislav Jabuka , Swatee Naik

We extend the state models for Jones and Alexander polynomials of classical links to state models of 2-variable polynomials in the case of singular links. Moreover, we extend both of them to polynomials with d+1 variables for long singular…

Geometric Topology · Mathematics 2007-10-03 T. Fiedler

We give a formula for Alexander polynomials of doubly primitive knots.

Geometric Topology · Mathematics 2007-05-23 Kazuhiro Ichihara , Toshio Saito , Masakazu Teragaito

Let $p$ be a prime number and let $K$ be a genus one two-bridge knot. In the spirit of arithmetic topology, we observe that if $p$ divides the size of the 1st homology group of some odd-th cyclic branched cover of the knot $K$, then its…

Geometric Topology · Mathematics 2026-01-28 Honami Sakamoto , Ryoto Tange , Jun Ueki

We investigate the twisted Alexander polynomial of a 2-bridge knot associated to a Fox coloring. For several families of 2-bridge knots, including but not limited to, torus knots and genus-one knots, we derive formulae for these twisted…

Geometric Topology · Mathematics 2012-06-12 Jim Hoste , Patrick D. Shanahan

Quandle 2-cocycles define invariants of classical and virtual knots, and extensions of quandles. We show that the quandle 2-cocycle invariant with respect to a non-trivial $2$-cocycle is constant, or takes some other restricted form, for…

Geometric Topology · Mathematics 2016-03-22 W. Edwin Clark , Masahico Saito

In this article, we present some of the properties of the $L^2$-Alexander invariant of a knot defined by Li and Zhang, some of which are similar to those of the classical Alexander polynomial. Notably we prove that the $L^2$-Alexander…

Geometric Topology · Mathematics 2014-02-10 Fathi Ben Aribi

We use the decomposition of o(3,1)=sl(2;C)_1\oplus sl(2;C)_2 in order to describe nonstandard quantum deformation of o(3,1) linked with Jordanian deformation of sl(2;C}. Using twist quantization technique we obtain the deformed coproducts…

High Energy Physics - Theory · Physics 2009-11-11 A. Borowiec , J. Lukierski , V. N. Tolstoy

We find that Alexander polynomial of a ribbon knot in $ \mathbb{Z}HS^3 $ is determined by the intrinsic singularity information of its ribbon, and give a formula to calculate Alexander polynomial of a ribbon knot by that. We define half…

Geometric Topology · Mathematics 2026-05-21 Sheng Bai

In 2012, Cohen, Dasbach, and Russell presented an algorithm to construct a weighted adjacency matrix for a given knot diagram. In the case of pretzel knots, it is shown that after evaluation, the determinant of the matrix recovers the Jones…

Geometric Topology · Mathematics 2024-08-27 Derya Asaner , Sanjay Kumar , Melody Molander , Andrew Pease , Anup Poudel

We generalize the classical study of Alexander polynomials of smooth or PL locally-flat knots to PL knots that are not necessarily locally-flat. We introduce three families of generalized Alexander polynomials and study their properties.…

Geometric Topology · Mathematics 2011-03-31 Greg Friedman