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Swarm-Based Gradient Descent Methods for Non-Convex Optimization

We discuss a novel class of swarm-based gradient descent (SBGD) methods for non-convex optimization. The swarm consists of agents, each is identified with position, x, and mass, m. There are three key...

Dynamics of Hamiltonian PDEs

In this talk I will discuss some results about long time behaviors of solutions to Hamiltonian PDEs (Schrödinger, Kirchhoff, etc). In particular I will focus on a recent result where we (with J. Berni...

Moduli of K3 Surfaces, Wall-crossing, and the Hassett-Keel Program

I will survey some results from the study of moduli spaces of higher dimensional varieties as well as the Hassett—Keel program for the moduli space of curves. I will then discuss applications of these...

Curve e dimostrazioni come boundary objects tra matematica e fisica: dall'analisi epistemologica alla formazione degli insegnanti e alle sperimentazioni in aula

In questo contributo si presenteranno alcuni risultati di un progetto di ricerca internazionale (IDENTITIES) sul tema dell'educazione all'interdisciplinarità tra matematica e fisica nella scuola secon...

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 tha...

Brauer groups of moduli problems and enumerative geometry

The Brauer group, classifying Azumaya algebras up to Morita equivalence, is a fundamental invariant in number theory and algebraic geometry. Given a moduli problem M (e.g. smooth curves of a given gen...

Donne nella matematica

In occasione dell'evento internazionale May12 Celebrating Women in Mathematics, giornata internazionale delle donne nella matematica, l'Unità pianificazione, programmazione e Biblioteca Centrale e l'I...

Fano 4-folds con fibrazioni razionali su 3-folds

Sia X una varietà di Fano liscia, complessa, di dimensione 4, e \(\rho(X)\) il suo numero di Picard. Inizieremo discutendo il seguente risultato: se \(\rho(X)>12\), allora X è un prodotto di superf...

Sheaves on hyper-Kähler manifolds

Abstract: Constructing hyper-Kähler manifolds is a hard problem. Up to deformation, all the known examples are built from moduli spaces of stable sheaves on a K3 (or abelian) surface. It is natural ...

Dirichlet problem for the Laplacian and the Bilaplacian in Lipschitz domains

We are interested here in questions related to the maximal regularity of solutions of elliptic problems with Dirichlet boundary condition (see [1]). For the last 40 years, many works have been concern...
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