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The topological underpinnings are presented for a new algorithm which answers the question: `Is a given knot the unknot?' The algorithm uses the braid foliation technology of Bennequin and of Birman and Menasco. The approach is to consider…

Geometric Topology · Mathematics 2014-11-11 Joan S. Birman , Michael D. Hirsch

The relationships between braid ordering and the geometry of its closure is studied. We prove that if an essential closed surface $F$ in the complements of closed braid has relatively small genus with respect to the Dehornoy floor of the…

Geometric Topology · Mathematics 2011-07-25 Tetsuya Ito

A knitted surface is a surface with or without closed components smoothly properly embedded in $D^2 \times B^2$, which is a generalization of a braided surface. A knitted surface is called a 2-dimensional knit if its boundary is the closure…

Geometric Topology · Mathematics 2025-10-23 Inasa Nakamura , Jumpei Yasuda

These notes were prepared to supplement the talk that I gave on Feb 19, 2004, at the First East Asian School of Knots and Related Topics, Seoul, South Korea. In this article I review aspects of the interconnections between braids, knots and…

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

We study the existence of incompressible embeddings of surfaces into the genus two handlebody. We show that for every compact surface with boundary, orientable or not, there is an incompressible embedding of the surface into the genus two…

Geometric Topology · Mathematics 2015-03-13 João Miguel Nogueira , Henry Segerman

We present the viewpoint of treating one-dimensional band structures as Riemann surfaces, linking the unique properties of non-Hermiticity to the geometry and topology of the Riemann surface. Branch cuts and branch points play a significant…

Mathematical Physics · Physics 2024-09-10 Heming Wang , Lingling Fan , Shanhui Fan

In this article, we propose a new approach for describing and understanding knots and links in a 3-manifold through the use of an embedded non-orientable surface. Specifically, we define a plat-like representation based on this…

Geometric Topology · Mathematics 2025-03-04 Alessia Cattabriga , Paolo Cavicchioli , Rama Mishra , Visakh Narayanan

We define the notion of a braided link cobordism in $S^3 \times [0,1]$, which generalizes Viro's closed surface braids in $\mathbb{R}^4$. We prove that any properly embedded oriented surface $W \subset S^3 \times [0,1]$ is isotopic to a…

Geometric Topology · Mathematics 2016-01-27 Mark C. Hughes

This paper is a survey on the theory of knotoids and braidoids. Knotoids are open ended knot diagrams in surfaces and braidoids are geometric objects analogous to classical braids, forming a counterpart theory to the theory of knotoids in…

Geometric Topology · Mathematics 2019-03-06 Neslihan Gügümcü , Louis H. Kauffman , Sofia Lambropoulou

This article is about Artin's braid group and its role in knot theory. We set ourselves two goals: (i) to provide enough of the essential background so that our review would be accessible to graduate students, and (ii) to focus on those…

Geometric Topology · Mathematics 2007-05-23 Joan S. Birman , Tara E. Brendle

We consider the space of embeddings of finitely many circles that bound disks in non-positively curved surfaces. We index the connected components of this space with finite rooted trees and show that the connected components are classifying…

Algebraic Topology · Mathematics 2026-01-21 Ryan C. Gelnett

We introduce a new construction of surfaces in $D^2 \times B^2$, called knitted surfaces or BMW surfaces, which are described as the trace of deformations of knits. Here, knits are tangles obtained from classical braids from splicing at…

Geometric Topology · Mathematics 2024-10-25 Inasa Nakamura , Jumpei Yasuda

We introduce the concept of a bridge trisection of a neatly embedded surface in a compact four-manifold, generalizing previous work with Alexander Zupan in the setting of closed surfaces in closed four-manifolds. Our main result states that…

Geometric Topology · Mathematics 2024-04-24 Jeffrey Meier

We list up to M\"obius equivalence all possible degrees and embedding dimensions of real surfaces that are covered by at least two pencils of circles, together with the number of such pencils. In addition, we classify incidences between the…

Algebraic Geometry · Mathematics 2024-09-16 Niels Lubbes

The surface singular braid monoid corresponds to marked graph diagrams of knotted surfaces in braid form. In a quest to resolve linearity problem for this monoid, we will show that if it is defined on at least two or at least three strands,…

Geometric Topology · Mathematics 2019-07-10 Michal Jablonowski

We study the problem of finding neck-like features on a surface. Applications for such cuts include robotics, mesh segmentation, and algorithmic applications. We provide a new definition for a surface bottleneck -- informally, it is the…

Computational Geometry · Computer Science 2026-01-14 Sam Ruggerio , Sariel Har-Peled

Knots and links which are closed 3-braids are a very special class. Like 2-bridge knots and links, they are simple enough to admit a complete classification. At the same time they are rich enough to serve as a source of examples on which,…

Geometric Topology · Mathematics 2008-05-14 Joan S. Birman , William W. Menasco

The main result of the paper is a boundedness for $n$-complements on algebraic surfaces. In addition, applications of this theorem to a classification of log Del Pezzo surfaces and of birational contractions for 3-folds are formulated.

alg-geom · Mathematics 2007-05-23 V. V. Shokurov

We consider finite-sheeted, regular, possibly branched covering spaces of compact surfaces with boundary and the associated liftable and symmetric mapping class groups. In particular, we classify when either of these subgroups coincides…

Geometric Topology · Mathematics 2020-03-11 Tyrone Ghaswala , Alan McLeay

Finding a totally geodesic surface, an embedded surface where the geodesics in the surface are also geodesics in the surrounding manifold, has been a problem of interest in the study of 3-manifolds. This has especially been of interest in…

Geometric Topology · Mathematics 2024-03-20 Brannon Basilio , Chaeryn Lee , Joseph Malionek
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