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In this paper we show that 0-resolution of a crossing in the Legendrian closure of a positive braid induces a cohomologically faithful $A_\infty$ functor on augmentation categories. In particular, we compute the bilinearized Legendrian…

Symplectic Geometry · Mathematics 2015-10-01 Michael Menke

For an embedded exact Lagrangian cobordism between Legendrian submanifolds in the 1-jet bundle, we prove that a generating family linear at infinity on the Legendrian at the negative end extends to a generating family linear at infinity on…

Symplectic Geometry · Mathematics 2024-06-18 Wenyuan Li

Many interesting spaces --- including all positroid strata and wild character varieties --- are moduli of constructible sheaves on a surface with microsupport in a Legendrian link. We show that the existence of cluster structures on these…

Symplectic Geometry · Mathematics 2019-12-19 Vivek Shende , David Treumann , Harold Williams , Eric Zaslow

We show that any knot which is smoothly the closure of a 3-braid cannot be Lagrangian concordant to and from the maximum Thurston-Bennequin Legendrian unknot except the unknot itself. Our obstruction comes from drawing the Weinstein…

Symplectic Geometry · Mathematics 2022-04-01 Angela Wu

We show that the family of smoothly non-isotopic Legendrian pretzel knots from the work of Cornwell-Ng-Sivek that all have the same Legendrian invariants as the standard unknot have front-spuns that are Legendrian isotopic to the front-spun…

Symplectic Geometry · Mathematics 2026-03-24 Georgios Dimitroglou Rizell , Roman Golovko

For an oriented surface link $S$, we can take a satellite construction called a 2-dimensional braid over $S$, which is a surface link in the form of a covering over $S$. We demonstrate that 2-dimensional braids over surface links are useful…

Geometric Topology · Mathematics 2015-10-19 Inasa Nakamura

In the symplectization of standard contact $3$-space, $\mathbb R \times \mathbb R^3$, it is known that an orientable Lagrangian cobordism between a Legendrian knot and itself, also known as an orientable Lagrangian endocobordism for the…

Symplectic Geometry · Mathematics 2016-11-30 Orsola Capovilla-Searle , Lisa Traynor

We construct a pair of isotopic link configurations that are not thick isotopic while preserving total length.

Geometric Topology · Mathematics 2023-03-28 Rob Kusner , Wöden Kusner

It is well known that there exist knots with Seifert surfaces of arbitrarily high genus. In this paper, we show the existence of infinitely many knot exteriors where each of which has longitudinal essential surfaces of any positive genus…

Geometric Topology · Mathematics 2025-08-26 Joao M. Nogueira

Many well studied knots can be realized as positive braid knots where the braid word contains a positive full twist; we say that such knots are twist positive. Some important families of knots are twist positive, including torus knots,…

Geometric Topology · Mathematics 2025-01-08 Siddhi Krishna , Hugh Morton

By proving a connected sum formula for the Legendrian invariant $\lambda_+$ in knot Floer homology we exhibit infinitely many transversely non simple knots.

Symplectic Geometry · Mathematics 2016-01-20 Vera Vértesi

We provide linear lower bounds for the signature of positive braids in terms of the three genus of their braid closure. This yields linear bounds for the topological slice genus of knots that arise as closures of positive braids.

Geometric Topology · Mathematics 2015-10-15 Peter Feller

The paper is devoted to prove a version of Milnor-Moore Theorem for connected braided bialgebras that are infinitesimally cocommutative. Namely in characteristic different from 2, we prove that, for a given connected braided bialgebra $A$…

Quantum Algebra · Mathematics 2008-04-18 A. Ardizzoni , C. Menini , D. Stefan

We use the Birman-Ko-Lee presentation of the braid group to show that all closures of strongly quasipositive braids whose normal form contains a positive power of the dual Garside element $\delta$ are fibered. We classify links which admit…

Geometric Topology · Mathematics 2016-11-01 Ian Banfield

We prove that any rational linear combination of Pontryagin numbers that does not factor through the universal elliptic genus is unbounded on connected closed spin manifolds of nonnegative sectional curvature.

Differential Geometry · Mathematics 2023-01-03 E. Hsiao , D. Kotschick

Links in $S^3$ can be encoded by grid diagrams; a grid diagram is a collection of points on a toroidal grid such that each row and column of the grid contains exactly two points. Grid diagrams can be reinterpreted as front projections of…

Geometric Topology · Mathematics 2025-12-08 Sarah Blackwell , David T. Gay , Peter Lambert-Cole

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

In this note, we prove a lower bound for the positive kinkiness of a closed braid which we then use to derive an estimate for the positive kinkiness of a link in terms of its Seifert system. As an application, we show that certain pretzel…

Geometric Topology · Mathematics 2007-05-23 Christian Bohr

We prove that there is no functorial universal finite type invariant for braids in $\Sigma\times I$ if the genus of $\Sigma$ is positive.

Geometric Topology · Mathematics 2007-05-23 Paolo Bellingeri , Louis Funar

We prove that there are at most two possibilities for the base of a Lagrangian fibration from a complex projective irreducible symplectic fourfold.

Algebraic Geometry · Mathematics 2015-05-11 Wenhao Ou