Venue Google Meet link. Abstract A two-layer quasi-geostrophic model for geophysical flows is studied, with the upper layer being perturbed…
Eventi
Two results about Grothendieck’s Section Conjecture – Giulio Bresciani (SNS Pisa)
Grothendieck’s Section Conjecture states that, if $X$ is an hyperbolic curve over a field $k$ finitely generated over $\mathbb{Q}$, every section of the map $\pi_1(X) \to \mathsf{Gal}(k)$ is associated with a rational point of the completion of $X$.…
Large deviations for coagulation processes: an approach via graphs – Luisa Andreis (Università di Firenze)
Interacting particle systems where particles interact via coagulation are of great interest for their various behaviours. In particular, interesting phenomena can occur, depending on the structure of the kernel which is giving a rate to each coagulation. …
Amenable open covers of aspherical spaces – Kevin Li (University of Southampton, UK)
Amenable groups are small from a large scale geometric point of view. If a space can be covered by few subsets with amenable fundamental group, there are strong vanishing results for several invariants…
Ulrich elements in normal affine semigroup rings – Dumitru Stamate (University of Bucharest)
We study the almost Gorenstein property in the sense of Goto et al for the class of normal semigroup rings. The graded version is related to the existence of what we call Ulrich elements for the semigroup. …
Matroid endomorphisms, derivatives, and Kolchin polynomials – Antongiulio Fornasiero (Università degli Studi di Firenze)
Let d be a finite tuple of commuting derivations on a field K. A classical result allows us to associate a numerical polynomial to d (the Kolchin polynomial), measuring the “growth rate” of d. A multi-variate version of the same polynomial is also…
TBA – Lee Darrick Yik (EPFL)
TBA…
Improved parallel-in-time integration via low-rank updates and interpolation – Stefano Massei (Università di Pisa)
This work is concerned with linear matrix equations that arise from the space-time discretization of time-dependent linear partial differential equations (PDEs). Such matrix equations have been considered, for example, in the context of…
Segregated solutions for some nonlinear Schrödinger systems – Angela Pistoia (Sapienza Università di Roma)
I will focus on the existence and multiplicity of positive non-radial solutions for some systems of Schrödinger equations in a weak fully attractive or repulsive regime in the presence or in absence of an external radial trapping. The results have…
Simplicial volume and aspherical manifolds – Marco Moraschini (Università di Bologna)
Simplicial volume is a homotopy invariant for compact manifolds introduced by Gromov in the early 80s. It measures the complexity of a manifold in terms of singular simplices.…