[K-OS] Knot Online Seminar
[K-OS] is an online research seminar which focuses on knot
theory and low-dimensional topology. Talks will be delivered
by authors of recent arXiv articles of significant interest.
It happens the 3rd Thursday of every month
from 16:15 to 17:15
(
CET/CEST Berlin,
Brussels, Madrid, Paris, Rome, Vienna, Warsaw, Zurich)
on
Zoom.
It is organized by
Marc
Kegel,
Alexandra
Kjuchukova,
Lukas
Lewark,
Delphine
Moussard
and
Anne-Laure
Thiel.
It benefits from logistical support from
the
CNRS and
ETHZ.
If there is a recent arXiv preprint which you would like to see featured on the seminar, please email the organizers with your suggestion.
The K-OS talks are also listed in a
Google Calendar.
Forthcoming Talks
July and August 2026
17 September 2026
- Speaker: Daniel Galvin (UT Austin)
- Title: Non-smoothable surfaces in the 4-sphere (arXiv:2603.22202)
- Abstract: I will describe how to construct topologically locally flat embedded surfaces inside the standard 4-sphere that are not isotopic to any smoothly embedded surface. These surfaces are non-orientable and their exteriors have order two fundamental group. This is joint work with Anthony Conway.
