[Dottorcomp] Insalate di Matematica - F. Mastrogiacomo 13/05/2025

[Insalate Di Matematica]

Dear all,

We remind you *today*'s appointment of the series of seminars "Insalate di
Matematica".
Here are the details:

*Speaker*: Fabio Mastrogiacomo (Università degli Studi di Milano-Bicocca)

*Date and time*: *13th of May 2025, 4:30 pm (CEST) ** (notice the unusual
day)*

*Title*: "Bases of permutation groups"

*Abstract*: Let G be a permutation group acting on a set Ω. A base for G is
a sequence of points in Ω whose pointwise stabilizer is trivial—that is, no
non-identity element of G fixes all the points in the sequence. In general,
a permutation group may have bases of varying sizes. This talk will explore
how these base sizes behave: do they always form an interval of natural
numbers? Can the set of possible base sizes be arbitrarily large or sparse?
We will see that the answers to these questions depend on two different
notions of bases: minimal bases and irredundant bases.

*Keywords:* Permutation groups, Irredundant bases, Minimal bases

*Information to attend in room 3014*
The seminar will take place in room 3014, at the building U5-Ratio,
Università degli Studi di Milano Bicocca.


*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=m3c536ba5a33f71bb9d6a3bc9b00992ad>

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_matematica24/

The organizers: Anna Donadini, Julian Feuerpfeil, Marco Fusari,
Kirubell Haile, Paolo Malanchini, Ettore Marmo, Fabio Mastrogiacomo,
Claudia Nocita, Eleonora Sforza and Tommaso Toti.