## On some minimization problems in R^N: choice of constraints, Lagrange multipliers and the concentration-compactness principle revisited. – Mihai Maris (Univ. Toulouse)

Venue Sala Riunioni (Dip. Matematica). Abstract…

## Fixed points, semigroups and rigidity of holomorphic mappings – David Shoikhet (ORT College Braude, Israele)

There is a long history associated with the problem of iterating nonexpansive and holomorphic mappings and finding their fixed points, with the modern results of K. Goebel, W.-A. Kirk, T. Kuczumow, S. Reich, W. Rudin and J.-P. Vigue’ being among the…

## Arithmetic of inertia in braids groups and Grothendieck-Teichmüller theory – Benjamin Collas (Bayreuth Universität)

Following Grothendieck’s “Esquisse d’un programme”, Grothendieck-Teichmüller theory is the study of the absolute Galois group of rational through combinatorial properties of the moduli spaces of curves Mg,n. Originally developed by…

## Optimization & numerical Analysis seminar – Methods for accurate invariant subspace computations – Federico Poloni – Dipartimento di Informatica, Univ. Pisa (Il Seminario si svolgerà al Dipartimento di Informatica – Sala Riunioni Est)

We consider two modelling problems, one arising in control theory (linear-quadratic regulator) and one arising in the modelling of queues (or buffers) under a continuous-time Markov model. The solution of both can be reduced to finding the invariant…

## Bifurcation and stability of solitons for the asymptotically linear NLS – François Genoud (Delft Institute of Applied Mathematics)

“Abstract”:The purpose of this talk is to convey the idea that bifurcation theory provides a powerful tool to prove existence and orbital stability of solitons for the nonlinear Schrödinger equation. It is especially useful to obtain results for…

## Hyperbolic volume of links, via pants graph and train tracks – Antonio De Capua (University of Oxford)

A result of Jeffrey Brock states that, given a hyperbolic 3-manifold which is a mapping torus over a surface $S$, its volume can be expressed in terms of the distance induced by the monodromy map in the pants graph of $S$. This is an abstract graph…

## Higher order geometric problems on compact manifolds – Prof. Zindine Djadli (Université de Grenoble, Institut Fourier)

Venue Sala Seminari (Dip. Matematica). Abstract…

## Analyticity of flow lines and level sets – H. Koch (Bonn University)

Venue Sala Riunioni (Dip. Matematica). Abstract…

## On the existence of spherical metrics with conical singularities on a 2-sphere – Gabriele Mondello (Università di Roma “La Sapienza”)

A celebrated result by Poincaré states that a compact Riemann surface ofpositive genus has a conformal metric of constant curvature, unique up torescaling. Clearly, the case of genus 0 is not so exciting: there is aunique complex structure and a…

## Optimization & numerical analysis seminars – Iterative approaches for graph-structured linear systems arising in optimization – Antonio Frangioni – Università di Pisa (Al Dipartimento di Informatica – Sala Seminari Ovest)

When applying Interior Point (IP) algorithm to the solution of linear or convex separable optimization problems with strong graph structure, like the Min Cost Flow (MCF) problem, one has to repeatedly solve linear systems with strong graph…

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