[PHK_seminar] Fwd: Seminar talk by Reinier Kramer [Tuesday 17/2 from 15:40]

[hvle]

-------- Forwarded message -------
 From: "Jan Kotrbaty" <kotrbaty at karlin.mff.cuni.cz>
To: ustav at karlin.mff.cuni.cz, 
mohamed-abdeldjalil.mouamine at matfyz.cuni.cz, "Michael Kompatscher"
<kompatscher at karlin.mff.cuni.cz>, "Vit Dolejsi" 
<dolejsi at karlin.mff.cuni.cz>,
pavel.patak at fit.cvut.cz, tusekmat at fjfi.cvut.cz, 
ustav-pgs at karlin.mff.cuni.cz
Sent: February 11, 2026 3:32 PM
Subject: Seminar talk by Reinier Kramer [Tuesday 17/2 from 15:40]
Dear colleagues,

let me invite you to the seminar talk of Reinier Kramer from Università 
degli Studi di
Milano-Bicocca that will take place on Tuesday, February 17 from 15:40 
in K1. The title and
abstract of the talk are below.

Please feel free to share the announcement with anyone who might 
possibly be interested.

Best regards,
Jan

Title: Hurwitz numbers through topological recursion

Abstract:
Hurwitz numbers are the counts of ramified covers of a given Riemann 
surface with specified
ramification data. After their introduction by Hurwitz in the 19th 
century, they were quickly
reinterpreted in terms of decompositions in symmetric groups and 
expressed in terms of characters.
At the start of this century, Okounkov and Pandharipande understood 
Hurwitz theory as also having
deep connections to Gromov-Witten theory and the Kadomtsev-Petviashvili 
integrable hierarchy. This
led to many new kinds of interesting Hurwitz numbers, as well as 
different ways to calculate them.
A particularly strong framework is Eynard-Orantin topological recursion, 
which entails many
structural properties of these numbers and their generating functions.
I will introduce these connected viewpoints, and show how the 
perspective of Hurwitz numbers still
yields new deep insights in many related areas.