Forcing axioms and inner models

Speaker: 

Professor Boban Velickovic

Institution: 

University of Paris 7

Time: 

Monday, October 30, 2006 - 4:00pm

Location: 

MSTB 256

Forcing axioms are natural combinatorial statements which decide many
of the questions undecided by the usual axioms ZFC of set theory. The
study of these axioms was initiated in the late 1960s by Martin and
Solovay who introduced Martin's Axiom, followed by the formulation of
the Proper Forcing Axiom by Baumgartener and Shelah in the early 1980s
and Martin's Maximum by Foreman, Magidor and Shelah in the mid-1980s.
In the mid 1990s Woodin's work on Pmax extensions established deep
connections between forcing axioms and the theory of large cardinals
and determinacy. Nevertheless, some of the key problems remained open.
In 2003 Moore formulated the Mapping Reflection Principle (MRP) which
seems to be the missing ingredient needed in order to resolve many of
the remaining open problems in the subject and a number of important
developments followed.

In this lecture I will survey some recent results on forcing axioms:
Moore's work on MRP, my work with A. Caicedo on definable well-orderings
of the reals, Viale's result that the Proper Forcing Axiom implies the
Singular Cardinal Hypothesis, etc.

Henon family, persistent tangencies, and celestial mechanics

Speaker: 

Anton Gorodetskii

Institution: 

Caltech

Time: 

Thursday, November 16, 2006 - 2:00pm

Location: 

MSTB 254

Celestial mechanics is a main parent" of the modern theory of
dynamical systems. Poincare proved non-integrability of the three body
problem when he discovered the homoclinic picture. Alexeev explained the
existence of the oscillatory motions (a planet approaches infinity
always returning to a bounded domain) in Sitnikov model (one of the
restricted versions of the three body problem) using methods of
hyperbolic dynamics.
We show that the structures related to the most recent works in the
smooth dynamical systems (e.g. conservative Henon family, lateral
thickness of a Cantor set, persistent tangencies, splitting of
separatrices) also appear in the three body problem. After we get some
new results in smooth dynamics (parameterized version of conservative
Newhouse phenomena, relation between lateral thicknesses and Hausdorff
dimension of a Cantor set, etc), we prove that in many cases the set of
oscillatory motions has a full Hausdorff dimension.
This is a joint work with V.Kaloshin.

Stochastic Attractors (Lecture I)

Speaker: 

Professor Hakima Bessaih

Institution: 

University of Wyoming

Time: 

Tuesday, October 10, 2006 - 4:00pm

Location: 

MSTB 254

This series of lectures will be concerned with the asymptotic behavior of some random dynamical system. The push-forward and pull-back approaches will be discussed. Some applications to stochastic reaction-diffusion equations and stochastic Navier-Stokes equations will be given.

Stochastic Attractors (Lecture II)

Speaker: 

Professor Hakima Bessaih

Institution: 

University of Wyoming

Time: 

Friday, October 13, 2006 - 4:00pm

Location: 

MSTB 254

This series of lectures will be concerned with the asymptotic behavior of some random dynamical system. The push-forward and pull-back approaches will be discussed. Some applications to stochastic reaction-diffusion equations and stochastic Navier-Stokes equations will be given.

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