[Dottorcomp] Insalate di matematica - A. Lorrain 22/04/2026

[Insalate Di Matematica]

Dear all,

For the *next appointment* of the series of seminars "Insalate di
Matematica", *Andreas Lorrain* (Vrije Universiteit Brussel & Università di
Milano-Bicocca) will give a talk.
The speaker will deliver the talk *in presence* and the meeting will also
be broadcasted *online* (see below for more information).

Here the details:

*Date and time*: *22nd of April 2026, 16:45 pm (CEST)*

*Title*: "Dehn-gerous groups!"

*Abstract*: In 1911 Max Dehn asked the following question: Given a group
defined by generators and relations, is there an algorithm that can
determine if a word represents the identity?
It turns out that this depends on the group. So, suppose that such an
algorithm exists for your favourite group. How fast is it? Gromov defined a
way to quantify this and called it the 'Dehn function'. One can see this
Dehn function as a measure of some sort of complexity of the group.
In this talk we will explore some of the subtleties of this problem and
consider a special set of groups: the Thompson groups F, T, and V. Are they
as complex as they look?

*Keywords:* Geometric group theory, Dehn functions, Thompson groups

*Information to attend in person*
The seminar will take place at the building U9-Koinè, Università degli
Studi di Milano Bicocca; room U9-05.


*Information to attend online*
https://unimib.webex.com/unimib/j.php?MTID=m101728a0c0258813b6aa97783fb11fad
(password: insalate, 46725283 from phones)
<https://unimib.webex.com/unimib/j.php?MTID=m101728a0c0258813b6aa97783fb11fad>

You can find the poster of the event in the attachment.
We are looking forward to seeing you!

For further information, please visit our website:
https://sites.google.com/view/insalate-di-matematica or contact us at
insalate.matematica a unimib.it. Find us also on our Instagram page:
https://www.instagram.com/insalate.di.matematica/
<https://www.instagram.com/insalate_di_matematica24/>

The organizers: Jessica Anzanello, Anna Donadini, Julian Feuerpfeil,
Kirubell Haile, Salvatore Lincastri, Paolo Malanchini, Marialetizia
Mosconi, Claudia Nocita, Eleonora Sforza, Filippo Valnegri.
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