I mercoledì del DIMI

Appuntamenti a cadenza settimanale di divulgazione scientifica organizzati dal DIMI

DoveAula Multimediale

Some recent work on the arithmetic nature of periods

Yves André

C.N.R.S. e Université P. et M. Curie, Parigi, VI

Periods are special numbers, given by integrals of rational functions with rational coefficients over domains defined by polynomial inequalities with rational coefficients. Classical theorems by Schneider on the transcendence of some periods have inspired Grothendieck a very general conjecture about polynomial relations with rational coefficients between periods, which Kontsevich, Zagier and Ayoub have reformulated in a [...]

Quando24/10/2012 - 17:30
DoveAula Multimediale

Numerical solution of Hyperbolic PDEs with astrophysical applications to relativistic plasmas

Olindo Zanotti

Dipartimento di Ingegneria Civile e Ambientale dell'Università di Trento

The numerical solution of hyperbolic partial differential equations has become a necessity in several branches of physics and applied mathematics. I will present the most modern numerical techniques that are currently adopted, based on the conservative formulation of hyperbolic equations, and with special attention to Finite Volume and to Discontinuous Galerkin Methods. As a relevant [...]

Quando9/11/2011 - 10:30
DoveAula Multimediale
ReferenteFranco Blanchini

Bipartite Graphs and Whitney Form Discretization of Helicity Functionals

P. Robert Kotiuga

Boston Universty

Explicit Whitney-form finite element discretizations of helicity functionals have been in the engineering literature for over two decades. These discretizations exhibit a version of the metric invariance enjoyed by the continuum functional and have applications to geometric inverse problems such as impedance tomography and the synthesis of force-free magnetic fields. This talk focuses on simplicial meshes [...]

Quando20/4/2011 - 17:00
DoveAula Multimediale
ReferenteRossana Vermiglio

Modelli matematici per lo stoccaggio dei rifiuti nucleari

Alexandre Ern

Scuola nazionale di Ingegneria Civile e Politecnico di Parigi

Sarà presentato a grandi linee il programma di ricerca francese relativo ai modelli matematici per lo stoccaggio dei rifiuti radioattivi in strati geologici profondi.

Quando16/2/2011 - 17:00
DoveAula Multimediale

Potentially dense sets in abelian groups

Dimitri Shakhmatov

Department of Mathematics of Faculty of Science of Ehime University (Matsuyama, Japan)

We consider 65 years old problem of Markov: Given a subset S of a group G, can we find a Hausdorff group topology on G in which the set T becomes dense? A related problem: Given a subset S of an abelian group G, can one find a homomorphism (or even better, a monomorphism) f: [...]