We consider a class of nonlinear population models on a two-dimensional lattice which are influenced by a small random potential, and we show that on large temporal and spatial scales the population density is well described by the continuous…
Categoria evento: Seminars
Chemical reaction networks: deterministic and stochastic models – Daniele Cappelletti (University of Wisconsin – Madison)
Chemical reaction networks are mathematical models used in biochemistry, as well as in other fields. Specifically, the time evolution of a system of biochemical reactions are modelled either deterministically, by means of a system of ordinary…
Kodaira fibrations with small signature – Sönke Rollenske (Univ. Marburg (Germania) )
Kodaira fibrations are surfaces of general type with a non-isotrivial fibration, which are differentiable fibre bundles. First examples were constructed by Kodaira and Atiyah to show that the signature need not be multiplicative in fibre bundles. We…
Colloqui con Zanichelli – Irene Barbensi, Giulia Laffi (Zanichelli editore)
A seguito dell’incontro del 28 aprile sono organizzati due giorni di colloqui con Irene Barbensi e Giulia Laffi della redazione…
Introduction to interacting particle systems – Michel Nassif (ENS Rennes)
Interacting particle systems is a recently developed field in the theory of Markov processes with many applications: particle systems have been used to model phenomena ranging from traffic behaviour to spread of infection and tumour growth. We…
Averaging along irregular curves and regularization of ODEs – Remi Catellier (Université de Nice Sophia-Antipolis)
Paths of some stochastic processes such as fractional Brownian Motion have some amazing regularization properties. It is well known that in order to have uniqueness in differential systems such as dy_t = b(y_t) dt, b needs to be quite regular.…
Modellare, Quantificare, Immaginare: perché la matematica fa la differenza nel lavoro e in democrazia! – Umberto Sampieri (Amministratore Delegato MASAI Srl)
Cercherò di raccontare pescando nella mia esperienza personale e in quella di amici e colleghi perché gli anni spesi a…
Gruppo fondamentale del link di singolarità – Mirko Mauri (LSGNT)
Ogni singolarità (isolata) è omeomorfa al cono sopra il bordo di un suo intorno locale detto link. Una serie di evidenze mostra l’esistenza di una forte connessione tra la topologia del link e la natura algebrica della singolarità. In particolare,…
L^2-Betti numbers and Riemannian volume – Sabine Braun (Karlsruher Institut für Technologie)
Gromov raised the question whether there is a universal bound for theL^2-Betti numbers of an aspherical manifold by its simplicial volume. A positive answer would yield, in combination with Gromov’s main inequality, an upper bound ofL^2-Betti…
Numerical Analysis Seminar – Tensor Analysis: Spectral Theory and Special Tensors – Liqun Qi (The Hong Kong Polytechnic University, Department of Applied Mathematics)
Eigenvalues for tensors were introduced in 2005. Since then, a rich theory on eigenvalues of tensors and special tensors has been developed. There are two main definitions of eigenvalues of tensors. One definition is based upon homogeneous…