----- Original Message ----- From: "Luigi De Pascale" depascal@dm.unipi.it To: "Liviana Paoletti" paoletti@dm.unipi.it Sent: Sunday, March 08, 2009 9:00 PM

Inoltro avviso di Seminario a me ora pervenuto. Cordiali saluti Liviana Paoletti

Seminari di Calcolo delle Variazioni Mercoledi' 11 marzo 2009 Ore 16,30, Sala riunioni, Dipartimento di Matematica

Prof. Massimo Gobbino (Univ. di Pisa)

Title: The Perona-Malik paradox

The Perona-Malik equation is the prototype of "forward-backward" parabolic equations. It is the formal gradient flow of an integral functional with non -convex integrand. From the analytic point of view one expect that an ill-posed problem. However numerical simulations presents an unexpected stability. This is known in the literature as "Perona-Malik paradox".

-- Luigi De Pascale: Indirizzo: Dipartimento di Matematica Applicata "U.Dini" Via Buonarroti 1/C, 56127 Pisa, ITALY Tel.: +39/050/2213869 Fax:050/2213802 E-mail: depascal AT dm.unipi.it

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