[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
Alexandra
Kjuchukova,
Lukas
Lewark,
Delphine
Moussard
and
Emmanuel
Wagner.
It benefits from logistical support from
the
CNRS, the university
of
Paris and the
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
25 June 2026
- Speaker: Michel Boileau (Aix–Marseille Université)
- Title: A ribbon knot which is not a symmetric union (arXiv:2606.02968)
- Abstract: The symmetric union construction, introduced by S. Kinoshita and H. Terasaka and extended by C. Lamm, provides a diagrammatic method to produce ribbon knots. There is no known obstruction for a ribbon knot to admit a symmetric union presentation. In this talk we give the first example of a ribbon knot which cannot be presented as a symmetric union. This is a joint work with Teruaki Kitano (Soka University) and Yuta Nozaki (Hokkaido University).
July and August 2026
17 September 2026
