Prossimi seminari del Dipartimento di Matematica


17
Gen

2022
The workshop brings together researchers working in complex and harmonic analysis, with a special emphasis on geometric aspects and tools. A session will be devoted to the discussion of open problems. The link for online participation are available on the meeting's webpage. The workshop is dedicated to the memory of Guido Weiss 1928-2021.
tra circa 3 ore

18
Gen

Martedì
tra circa 5 ore

18
Gen

Martedì
Marco Andreatta
Lifting from an ample section.The case of weighted blow-ups

seminario di algebra e geometria

 ore 16:00
  presso - Aula Da Stabilire -
A classical method to study a projective variety is to consider its hyperplane section and ”lift” the properties of the section to the variety. This is sometime called Aplollonius method and it works well since in general a variety is at least as special as any of its hyperplane sections. For example a weighted projective space can be an hyperplane section only of a weighted projective space (S. Mori 1975). We extend this result in a ”relative situation”, namely we consider f : X → Z to be a local, projective, divisorial contraction between normal varieties of dimension n with Q-factorial singularities and Y ⊂ X to be a f-ample Cartier divisor. If f|Y : Y → W has a structure of a weighted blow-up then f : X → Z, as well, has a structure of weighted blow-up. As an application we consider a local projective contraction f : X → Z from a variety X with terminal Q-factorial singularities, which contracts a prime divisor E to an isolated Q-factorial singularity P ∈ Z, such that −(KX + (n − 3)L) is f-ample, for a f-ample Cartier divisor L on X. Using the above result, the existence of a ”good” general section of L and the existing results in dimension 3, we prove that (Z,P) is a hyperquotient singularity and f is a weighted blow-up.

19
Gen

Mercoledì
Marco Andreatta
Archimede, l'arte della misura

seminario interdisciplinare

 ore 15:30
  presso - Aula Da Stabilire -
Misurare lo spazio è cruciale per il nostro processo di conoscenza. Archimede è un pioniere della geometria, nella sua accezione più letterale di «misura della terra». Primo nel misurare enti curvi nello spazio e nel calcolare la superficie e il volume della sfera, fu geniale nel metodo, che affascinò tutti i grandi protagonisti della scienza moderna: da Galileo che ne riprenderà le dimostrazioni con una sensibilità nuova, a Gauss che ne estende i calcoli con conseguenze mirabolanti, fino a Einstein che con la sua Equazione di campo scopre una delle formule più famose della storia del pensiero scientifico, un’espressione che può essere pensata come la versione contemporanea della formula di Archimede.

21
Gen

Venerdì
Isidoros Iakovidis
Szemeredi’s theorem I

nell'ambito della serie: COMPLEX ANALYSIS LAB

seminario interdisciplinare

 ore 16:00
  presso - Aula Da Stabilire -
seminario on line •
In this series of expository talks we introduce and discuss tools of ergodic theory such as recurrence theorems in order to give the proof of Szemeredi’s theorem.

24
Gen

Lunedì
Giulio Tralli
Kolmogorov-type operators and Krylov-Safonov theory: state of the art and partial results

nell'ambito della serie: SEMINARI DI PROBABILITÀ E STATISTICA MATEMATICA

seminario di probabilità

 ore 16:00
In this talk we will discuss the validity of Harnack inequalities for linear evolution equations modelled after the Kolmogorov operator. The main focus will be on nondivergence form equations with non-smooth coefficients, and on the absence of an analogue of the ABP maximum principle and of the Krylov-Safonov theory in this setting. In particular, we will highlight as the (very general) crucial ingredient some quantitative point-to-measure estimate for nonnegative subsolutions. With this perspective in mind, we will show a potential theory approach (established in a 2019 joint work with F. Abedin) which allows to prove invariant Harnack inequalities for Kolmogorov-type operators with coefficients satisfying either a Cordes-Landis assumption or a continuity hypothesis.

27
Gen

Giovedì
Gregorio Chinni
On the regularity of solutions and of analytic vectors for ``sums of squares"

nell'ambito della serie: SEMINARI DI ANALISI MATEMATICA BRUNO PINI

seminario di analisi matematica

 ore 16:00
  presso Aula Vitali
seminario on line • collegamento al meeting
We present some results concerning the local and global regularity of the solutions for some classes/models of sums of squares of vector fields with real-valued real analytic coefficients of Hörmander type. Moreover we also illustrate a result concerning the microlocal Gevrey regularity of analytic vectors for operators sums of squares of vector fields with real-valued real analytic coefficients of Hörmander type, thus providing a microlocal version, in the analytic category, of a result due to M. Derridj.

01
Feb

Martedì
Simonetta Abenda
KP soliton theory, dimer models in the disc and totally non-negative Grassmannians

nell'ambito della serie: TOPICS IN MATHEMATICS 2021/2022

seminario di analisi matematica

 ore 11:00
  presso Aula Vitali
seminario on line • collegamento al meeting su zoom
Totally non-negative Grassmannians are a special case of G. Lusztig extension of the classical notion of total positivity, and have been combinatorially characterized in a seminal paper by A. Postnikov. They also appear in many relevant problems of mathematical and theoretical physics. The Kadomtsev-Petviashvili (KP) equation is the first non-trivial flow of the most relevant classical integrable hierarchy, and was originally introduced to study the stability of soliton solutions of another integrable system, the Kortweg-de Vries equation. Kasteleyn theorem represents the number of dimer configurations in planar graphs as determinants of sign matrices. In this talk I shall explain the role of totally non-negative Grassmannians in the characterization of the asymptotic behavior in space-time of a class of solutions of the Kadomtsev-Petviashvili equation, in the solution of a spectral problem for the same equation and in counting dimer configurations in planar bipartite graphs in the disc. The presentation will be elementary and self-contained.

01
Feb

Martedì
Giovanni Cerulli Irelli (Sapienza Università di Roma)
Symmetric representation theory of quivers and connections to Lie theory

nell'ambito della serie: SEMINARIO DI ALGEBRA E GEOMETRIA

seminario di algebra e geometria

 ore 14:00
  presso Aula Seminario VIII piano
The representation theory of quivers and finite dimensional algebras deals with representations of products of general linear groups, and it is hence a ``type A situation''. There are many attempts to drag into the pictures groups of other nature. In this talk I will talk about a new attempt to get actions of groups of type B,C and D on the representation varieties associated to algebras with self-duality based on joint works with Magdalena Boos and partially with Francesco Esposito. For hereditary algebras this reduces to the approach due to Derksen and Weyman in 2002 when they introduced the so-called ``symmetric quivers''. In the first part I will mostly talk about quivers of type A and their symmetric representation theory, and state one of our main result with Lena which states that the symmetric orbit closures are induced by non-symmetric ones for symmetric quivers of finite type. Then I will talk about the connection with 2-nilpotent Borel orbits in classical Lie algebra worked out with Lena and Francesco and give an example that shows that in this context is not true the orbit closures of type D are induced by type A. I will close the talk by stating various conjectures and open problems concerning the problem of when symmetric orbit closures are induced by type A.

01
Feb

Martedì
Dario Corona (Università di Camerino)
The critical exponent functions

seminario di sistemi dinamici

 ore 14:30
  presso Seminario I
The critical exponent of a word is an important combinatorial concept which has applications in symbolic dynamics and transcendental number theory. It is natural to define a countable class of interval self-maps sending every real in [0,1] to the inverse of the critical exponent of its base-n expansion. In the investigation of these maps, an interesting interplay emerges between recent results on the dynamics of densely discontinuous maps and combinatorial properties of words. Moreover, these maps provide examples of semi-continuous maps with very rich dynamics. This can be a useful starting point for the systematic investigation of the topological dynamical properties of this kind of maps, which is yet to begin.

02
Feb

Mercoledì
Alessandro Della Corte (Università di Camerino)
Dynamics of interval maps with dense discontinuities

seminario di sistemi dinamici

 ore 14:30
  presso Seminario I
Continuity is often taken as a defining assumption of topological dynamical systems. In the last years, however, increasing attention has been paid to the investigation of highly discontinuous maps from the point of view of topological dynamics. Continuity has been relaxed in ways allowing a dense set of discontinuous points: for instance Darboux, Baire 1 and 2, almost-continuous and quasi-continuous maps have been considered. There are good reasons, beyond the mere search for generality, for this research direction. The talk will discuss these reasons and will describe a particular class of densely discontinuous maps, i.e. those generated by the symbolic action of erasing substitutions on the binary expansion of reals in the unit interval.

17
Feb

Giovedì
Fabiana Leoni
TBA

nell'ambito della serie: SEMINARI DI ANALISI MATEMATICA BRUNO PINI

seminario di analisi matematica

 ore 16:00
  presso - Aula Da Stabilire -
seminario on line •
TBA

04
Mar

Venerdì
Walter Cavini
I paradossi di Zenone nel contesto della storia della filosofia antica

nell'ambito della serie: SEMINARI PROGETTO VAST

seminario interdisciplinare

 ore 16:00
  presso - Aula Da Stabilire -

11
Mar

Venerdì
Vincenzo Fano
La lunga storia dei paradossi dello spazio tempo

nell'ambito della serie: SEMINARI PROGETTO VAST

seminario interdisciplinare

 ore 16:00
  presso - Aula Da Stabilire -

13
Apr

Mercoledì
Alessandro Sarti
L'emergenza semiolinguistica

nell'ambito della serie: SEMINARI PROGETTO VAST

seminario interdisciplinare

 ore 16:00
  presso - Aula Da Stabilire -

25
Mag

Mercoledì
Balconi Michela
Tempo, coscienza e scienze cognitive

nell'ambito della serie: SEMINARI PROGETTO VAST

seminario interdisciplinare

 ore 14:00
  presso - Aula Da Stabilire -

25
Mag

Mercoledì
Mario De Caro
Tempo e coscienza tra filosofia morale e neuroscienze

nell'ambito della serie: SEMINARI PROGETTO VAST

seminario interdisciplinare

 ore 16:00
  presso - Aula Da Stabilire -

01
Ott

Sabato
Liliana Albertazzi
TBA

nell'ambito della serie: SEMINARI PROGETTO VAST

seminario interdisciplinare

 ore 09:00
  presso - Aula Da Stabilire -

08
Ott

Sabato
Alessandro Sarti
L' eterogenesi differenziale

nell'ambito della serie: SEMINARI PROGETTO VAST

seminario interdisciplinare

 ore 09:00
  presso - Aula Da Stabilire -

21
Ott

Venerdì
Matteo Marchesini
Epifania, noia e inganno. Il significato del tempo in alcuni scrittori moderni

nell'ambito della serie: SEMINARI PROGETTO VAST

seminario interdisciplinare

 ore 15:00
  presso - Aula Da Stabilire -

21
Ott

Venerdì
Antonella Tramacere
La percezione del tempo nell'esperienza di sé

nell'ambito della serie: SEMINARI PROGETTO VAST

seminario interdisciplinare

 ore 17:00
  presso - Aula Da Stabilire -

28
Ott

Venerdì
Maurizio Giani
La musica nello spazio

nell'ambito della serie: SEMINARI PROGETTO VAST

seminario interdisciplinare

 ore 17:00
  presso - Aula Da Stabilire -

29
Ott

Sabato
Maurizio Giani
Lo spazio nella musica

nell'ambito della serie: SEMINARI PROGETTO VAST

seminario interdisciplinare

 ore 09:00
  presso - Aula Da Stabilire -