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Knots and links in 3-manifolds are studied by applying intersection invariants to singular concordances. The resulting link invariants generalize the Arf invariant, the mod 2 Sato-Levine invariants, and Milnor's triple linking numbers.…

Geometric Topology · Mathematics 2016-01-20 Rob Schneiderman

In this paper we study the skein modules of the surfaces, $\Sigma_{i,j}$ $(i,j)\in \{(0,2),(0,3),(1,0),(1,1)\}$ at $2N$-th roots of unity where $N\geq 3$ is an odd counting number and construct Frobenius algebras from them.

Geometric Topology · Mathematics 2024-07-30 Nel Abdiel , Charles Frohman

We classify connected sums of three-dimensional lens spaces which smoothly bound rational homology balls. We use this result to determine the order of each lens space in the group of rational homology 3-spheres up to rational homology…

Geometric Topology · Mathematics 2014-10-01 Paolo Lisca

This is a review article on the Bennequin-Birman-Menasco machinery for studying embedded incompressible surfaces in 3-space via their `braid foliations'. Two cases are investigated: case (1) The surface has non-empty boundary; the boundary…

Geometric Topology · Mathematics 2007-05-23 Joan S. Birman , Elizabeth Finkelstein

In this paper we study embeddings of contact manifolds using braidings of one manifold about another. In particular we show how to embed many contact 3-manifolds into the standard contact 5-sphere. We also show how to obstruct braidings of…

Geometric Topology · Mathematics 2017-05-04 John B. Etnyre , Ryo Furukawa

We classify closed 3-braids which are L-space knots.

Geometric Topology · Mathematics 2019-11-05 Christine Ruey Shan Lee , Faramarz Vafaee

We determine the structure of the Kauffman bracket skein module of the connected sum of two genus one handlebodies over the ring of Laurent polynomials $\mathbb Z[q^{\pm 1}]$, thereby proving a conjecture posed by the first and third…

Geometric Topology · Mathematics 2026-04-14 Rhea Palak Bakshi , Thang T. Q. Lê , Józef H. Przytycki

Homology groups of spaces of nonsingular polynomial embeddings ${\bf R}^1 \to {\bf R}^n$ of degrees $\le 4$ are calculated. A general algebraic technique of such calculations for spaces of polynomial knots of arbitrary degrees is described.

q-alg · Mathematics 2008-02-03 Victor Vassiliev

To a compact oriented surface of genus at most one with boundary, we associate a quantized $K$-theoretic Coulomb branch in the sense of Braverman, Finkelberg, and Nakajima. In the case where the surface is a three- or four-holed sphere or a…

Representation Theory · Mathematics 2024-01-15 Dylan G. L. Allegretti , Peng Shan

We determine the action of the Kauffman bracket skein algebra of the torus on the Kauffman bracket skein module of the complement of the 3-twist knot. The point is to study the relationship between knot complements and their boundary tori,…

Geometric Topology · Mathematics 2021-02-12 Razvan Gelca , Hongwei Wang

Let $G$ be a nonabelian, simple group with a nontrivial conjugacy class $C \subseteq G$. Let $K$ be a diagram of an oriented knot in $S^3$, thought of as computational input. We show that for each such $G$ and $C$, the problem of counting…

Geometric Topology · Mathematics 2021-08-18 Greg Kuperberg , Eric Samperton

We study skein modules using $Sp(2n)$ webs. We define multivariable analogues of Chebyshev polynomials in the Type $C$ setting and use them to construct transparent elements in the skein module at roots of unity. Our arguments are…

Geometric Topology · Mathematics 2025-09-16 Vijay Higgins , Haihan Wu

This paper presents a novel framework for studying knotted and braided configurations of optical fields, moving beyond the conventional Hopfion solution based on the Hopf fibration. By employing the Seifert fibration, a preferred framing is…

Mathematical Physics · Physics 2024-07-29 Annalisa Marzuoli , Nicola Sanna

We study a certain skein element in the relative Kauffman bracket skein module of the disk with some marked points, and expand this element in terms linearly independent elements of this module. This expansion is used to compute and study…

Geometric Topology · Mathematics 2017-06-06 Mustafa Hajij

In this paper we study the theory of knotoids and braidoids and the theory of pseudo knotoids and pseudo braidoids on the torus T. In particular, we introduce the notion of {\it mixed knotoids} in $S^2$, that generalize the notion of mixed…

Geometric Topology · Mathematics 2021-03-31 Ioannis Diamantis

For a commutative Frobenius algebra $A$, we construct a $(2,3,3+\varepsilon)$-dimensional TQFT $\mathsf{AFK}_A$ that assigns to a 3-manifold a skein module of embedded $A$-decorated surfaces. These surface skein modules have been first…

Quantum Algebra · Mathematics 2025-12-03 Leon J. Goertz

We compute the action of the $\mathfrak{gl}_2$-skein algebra of the torus on the $\mathfrak{gl}_2$-skein module of the solid torus. As a result, we show that the $\mathfrak{gl}_2$-skein modules of lens spaces is spanned by…

Geometric Topology · Mathematics 2021-10-28 Hoang-An Nguyen

The skein lasagna module is an extension of Khovanov-Rozansky homology to the setting of a four-manifold and a link in its boundary. This invariant plays the role of the Hilbert space of an associated fully extended (4+epsilon)-dimensional…

Geometric Topology · Mathematics 2023-04-26 Ciprian Manolescu , Kevin Walker , Paul Wedrich

We determine the skein-valued Gromov-Witten partition function for a single toric Lagrangian brane in $\mathbb{C}^3$ or the resolved conifold. We first show geometrically they must satisfy a certain skein-theoretic recursion, and then solve…

Symplectic Geometry · Mathematics 2021-01-01 Tobias Ekholm , Vivek Shende

The Kauffman bracket skein module $K(M)$ of a $3$-manifold $M$ is the quotient of the $\mathbb{Q}(A)$-vector space spanned by isotopy classes of links in $M$ by the Kauffman relations. A conjecture of Witten states that if $M$ is closed…

Geometric Topology · Mathematics 2020-12-09 Renaud Detcherry