Sanjoy Mitter, Massachusetts Institute of Technology (Cambridge, Stati Uniti) Information and Entropy Flow in Filtering and Control Tuesday, June 13 2006, at 17:00 Dipartimento di Matematica - Politecnico di Milano - Via Bonardi 9 - Milano - Aula Seminari VI piano |
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Jan Chabrowski, University of Queensland (Australia) The Neumann problem for semilinear elliptic equations with critical Sobolev exponent Tuesday, May 16 2006, at 17:00 Dipartimento di Matematica - Università degli Studi - Via Saldini 50 - Milano - Sala di Rappresentanza |
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Claudio Canuto, Politecnico di Torino l trattamento numerico di problemi ellittici in domini aleatori Monday, May 08 2006, at 17:00 Dipartimento di Matematica - Università degli Studi - Via Saldini 50 - Milano - Sala di Rappresentanza |
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Nina Nikolaevna Uraltseva, Università di San Pietroburgo (Russia) Regularity of free boundaries for obstacle type problems Tuesday, May 02 2006, at 17:00 Dipartimento di Matematica - Politecnico di Milano - Via Bonardi 9 - Milano - Aula Seminari VI piano |
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Carlo F. Barenghi, University of Newcastle upon Tyne (Gran Bretagna) The degree of tangleness of turbulent vortex filaments Monday, April 10 2006, at 15:00 Dipartimento di Matematica e Applicazioni - Università degli Studi di Milano Bicocca - Via Cozzi, 53 |
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Abstract
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Long, filamentary structures which are disordered, knotted or tangled are ubiquitous in Nature. Examples range from long molecules and DNA, to magnetic field lines in astrophysical plasmas, to vortex structures or patticle paths in turbulent flows. The aim of this talk is to show that simple ideas from knot theory can be used to characterize the complexity of these structures. The two examples which I shall discuss are turbulence in superfluid helium and classical turbulence in an ordinary viscous fluid. The former is a particularly nice benchmark to apply these ideas, because it consists of a tangle of discrete vortex lines. |
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Paul Malliavin, Université Pierre et Marie Curie (Parigi, Francia) Hypoellipticity of the evolution of interest rate curve: theory and econometrics Monday, March 27 2006, at 14:45 Dipartimento di Matematica - Politecnico di Milano - Via Bonardi 9 - Milano - Sala Consiglio VII piano |
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