Young Researcher's Workshop on Positivity in Lie Groups


The aim of this workshop is to understand the notion of total positivity and Theta-positivity and how it relates to Higher Teichmüller theory. Theta-positivity is a notion of positivity in semisimple Lie groups and was recently introduced by Guichard and Wienhard in Positivity and higher Teichmüller theory as a generalization of Lusztig’s total positivity.

The workshop is aimed at graduate students that are interested in the topic. Every participant will play an active role in the seminar - either by preparing a talk, or by organizing an exercise session to consolidate what has been learned.

Download the abstract for the workshop as pdf, or a more detailed outline of the topics that are going to be covered.


The workshop will take place from January 10th to 14th, 2022.

The preliminary timetable for the workshop is available here.


The workshop will take place at the IWH Heidelberg.


Travel to Heidelberg is simple by train or by plane to Frankfurt am Main, which is an hour away by train from Heidelberg. All talks will take place at IWH. To get to the IWH from the main station (Heidelberg Hbf), take the bus 20 direction Karlsplatz for 12 minutes, get off at Karlsplatz and walk 3 minutes to IWH. There are also other bus options which might involve longer trips on the bus or longer walking.

Accomodation for all participants will be provided at IWH in double rooms. Lunches from Monday to Friday will also be provided at the IWH. The participants are free to organize their own dinners. We have limited funding to reimburse travel costs.


The list of participants includes:

Lisa Ricci

Arnaud Maret

Marta Magnani

Sofia Amontova

Enrico Trebeschi

Thomas Le Fils

Victor Jaeck

Luca De Rosa

Suzanne Schlich

Jacques Audibert

Daniel Soskin

Alex Moriani

Colin Davalo

Max Riestenberg

Nguyen Thi Dang

Yohann Bouilly

Raphael Appenzeller

Francesco Fournier Facio

Samuel Bronstein

Xian Dai

Ilia Smilga

Jingyi Xue

Romeo Troubat

Clarence Kineider

Fernando Cadena Camacho

Merik Niemeyer

Valdo Tatitscheff

Balthazar Fléchelles

Pierre-Louis Blayac

Dani Kaufman

Xenia Flamm

Do you have any question ? Then simply contact the organizers: Xenia Flamm and Arnaud Maret. We are very thankful to Mareike Pfeil for all the work she initially put in to organize the workshop!

We gratefully acknowledge funding from the STRUCTURES - Cluster of Excellence Young Researcher’s Convent. We thank the IWH Heidelberg for providing its rooms.