[Dottorcomp] Insalate di matematica - C. Echter 11/02/2026

[Insalate Di Matematica]

Dear all,

For the *next appointment* of the series of seminars "Insalate di
Matematica", *Carolyn Echter* (University of Regensburg) 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*: *11th of February 2026, 4:45 pm (CET)*

*Title*: "Abstract weight filtrations"

*Abstract*: Weight filtrations have their origin in "Théorie de Hodge: II,
III" (1971, 74): While classical Hodge theory yields pure Hodge structures
on the cohomology groups of smooth projective complex varieties, Deligne
extends this by constructing a filtration on the cohomology of an arbitrary
complex variety such that the graded pieces are pure. He refers to the
resulting filtered objects as mixed Hodge structures. Mixed structures
later appeared also in other contexts, such as the theory of Galois
representations, and they share many features, for example they form
abelian categories. Weights are closely related to slopes: Both control
when nonzero morphisms are admissible. The key difference is that slope
filtrations and weight filtrations are indexed in the opposite sense. Based
on André's formalisation of slope filtrations, we will set up an abstract
framework within which the shared properties of mixed structures become a
formal consequence of this fact.

*Keywords:* Weight and slope filtrations, Mixed Hodge structures

*Information to attend in person*
The seminar will take place at the building U9-Koinè, Università degli
Studi di Milano Bicocca; room U9-09.


*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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