Prossimi notiziari settimanali
Su questa pagina, è possibile visualizzare le richieste approvate dai redattori per la pubblicazione di eventi nel notiziario scientifico delle prossime 2 settimane.
Notiziario dei seminari di carattere matematico
a cura del Dipartimento di Matematica Guido Castelnuovo, Sapienza Università di Roma
Settimana dal 20-05-2024 al 26-05-2024
Martedì 21 maggio 2024
Ore 14:30, aula d'Antoni, Dipartimento di Matematica, Università di Roma Tor Vergata
seminario di Geometria
Marco D'Addezio (IRMA Strasbourg)
Edged Crystalline Cohomology
I will talk about a new cohomology theory for algebraic varieties in positive characteristic, called edged crystalline cohomology. This is a generalisation of crystalline cohomology and depends on the choice of a "decay-function''. Linear decay-functions correspond to integral versions of rigid cohomology, while logarithmic decay-functions produce the conjectured family of log-decay crystalline cohomology theories, parametrised by positive real numbers. During the talk, I will explain the construction of this theory after a brief recall of the classical crystalline and rigid cohomology theories.
Per informazioni, rivolgersi a: guidomaria.lido@gmail.com
Mercoledì 22 maggio 2024
Ore 14:00, Sala di Consiglio, Dipartimento di Matematica, Sapienza Università di Roma
Seminario di Algebra e Geometria
George Lusztig (Massachusetts Institute of Technology)
Decomposing a reductive group into strata
Let G be a reductive connected group over an algebraically closed field of characteristic p . Of particular importance in the study of G is the set u(G) of unipotent conjugacy classes. It is known that the cardinal of u(G) depends on p. We propose to define another set str(G) which is closely related to u(G) but is independent of p. But while u(G) is a subset of the set of conjugacy classes, str(G) is a quotient of that set. Its elements can be viewed as parts of a partition of G. We also show that the set of conjugacy classes in the Weyl group is partitioned according to str(G). This seminar is part of the activities of the Dipartimento di Eccellenza CUP B83C23001390001 and it is funded by the European Union – Next Generation EU.
Mercoledì 22 maggio 2024
Ore 16:00, Aula M3, Dipartimento di Matematica e Fisica, Università Roma Tre
Junior seminar di Geometria Algebrica
Zakaria Brahimi (Università degli studi Roma Tre)
Cubic fourfolds: some rational examples
Projective spaces are the most basic algebraic varieties that we know and rational varieties are those that are the closest possible to being projective spaces. The question of rationality of algebraic varieties has led to the development of a rich and beautiful theory and many questions are still open. Historically, the rationality problem for quadric and cubic surfaces was settled classically over one hundred years ago. In this seminar, we will talk about some rational cubic fourfolds that are known. We look for them inside Hassett Divisors; These divisors are codimension one varieties in the Moduli space of cubic fourfolds. Maggiori informazioni sul sito: https://ricerca.mat.uniroma3.it/seminari/junior_seminars.html
Le comunicazioni relative a seminari da includere in questo notiziario devono pervenire esclusivamente
mediante apposita form da compilare online, entro le ore 24 del giovedì precedente la settimana
interessata. Le comunicazioni pervenute in ritardo saranno ignorate.
Per informazioni, rivolgersi all'indirizzo di posta elettronica
seminari@mat.uniroma1.it.
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di comunicare il proprio indirizzo di posta elettronica a
seminari@mat.uniroma1.it.