Special Events and Conferences

Jun 20

Joshua Greene

On curves intersecting at most once
Taplin Auditorium / -

How many essential simple closed curves can you draw on a surface so that no two are homotopic and no two intersect more than once?  I will discuss… See Full Abstract

Jun 20

Robert Lipshitz

Computing involutive HF-hat
Taplin Auditorium / -

Hendricks-Manolescu's "involutive Heegaard Floer homology"

is a variant of Heegaard Floer homology which capitalizes on… See Full Abstract

Jun 20

Yi Xie

Surgery, Polygons and Instanton Floer homology
Taplin Auditorium / -

Many classical numerical invariants (including Casson invariant, Alexander polynomial and Jones polynomial) for 3-manifolds or links satisfy surgery… See Full Abstract

Jun 20

Maggie Miller

The Price twist via trisections
Taplin Auditorium / -

The Price twist is a surgery operation on an $RP^2$ in a 4-manifold that may change the smooth structure of the 4-manifold.… See Full Abstract

Jun 20

Matthew Hedden

Irreducible homology S^1xS^2s which aren't zero surgery on knot
Taplin Auditorium / -

Irreducible homology S^1xS^2s which aren't zero surgery on knot

Abstract: I'll discuss constructions of manifolds with… See Full Abstract

Jun 21

Duncan McCoy

Lattices, embeddings and Seifert fibered spaces.
Taplin Auditorium / -

Every Seifert fibered homology sphere bounds a definite star-shaped plumbing. In 1985 Neumann and Zagier used the R-invariant of Fintushel and Stern to… See Full Abstract

Jun 21

Kyle Hayden

A user's guide to building ribbon surfaces and holomorphic curves in 4-manifolds
Taplin Auditorium / -

We'll review a variety of hands-on ways to build ribbon surfaces in 4-manifolds, with an eye towards building holomorphic curves and symplectic/Lagrangian… See Full Abstract

Jun 21

Hannah Schwartz

The Presence of 2-Torsion
Taplin Auditorium / -

Two knots in S^3 are ambiently isotopic if and only if there is an orientation preserving automorphism of S^3 carrying one knot to the other (this follows… See Full Abstract

Jun 21

Lisa Piccirillo

Shake genus and slice genus
Taplin Auditorium / -

An important difference between high dimensional smooth manifolds and smooth 4-manifolds is that in a 4-manifold it is not always possible to represent… See Full Abstract

Jun 21

Jacob Rasmussen

Floer homology of manifolds with torus boundary
Taplin Auditorium / -

The bordered Floer homology of a 3-manifold with torus boundary determines an object in the Fukaya category of the punctured torus. This object takes the… See Full Abstract

Jun 22

András Stipsicz

Upsilon invariants of knots
Taplin Auditorium / -
Jun 22

Irving Dai

Homology cobordism and local equivalence between plumbed manifolds
Taplin Auditorium / -

 Recently constructed by Hendricks and Manolescu, involutive Heegaard Floer homology provides several new tools for studying the three-dimensional homology… See Full Abstract

Jun 22

Jennifer Hom

Knot concordance in homology cobordisms
Taplin Auditorium / -

We consider the group of knots in homology spheres that bound homology balls, modulo smooth concordance in homology cobordisms.  Answering a question of… See Full Abstract