Ergodic theory

Thursday, November 29, 2012 - 10:30am - 11:30am
Balazs Szegedy (University of Toronto)
Szemeredi's regularity lemma has opened up a new perspective in understanding very large structures. It has numerous applications in combinatorics, computer science and many other areas. A similar story of success is the theory of (characteristic) factors in ergodic theory. In the present talk we show how to look at these subjects from a unified point of view in the frame of which limits of structures are considered.
Wednesday, May 30, 2012 - 11:00am - 12:00pm
Izabella Laba (University of British Columbia)
The Favard length of a planar set E is the average length of its one-dimensional projections. In a joint project with Bond and Volberg, we prove new upper bounds on the decay of the Favard length of finite iterations of 1-dimensional planar Cantor sets with a rational product structure. This improves on the earlier work of Nazarov-Peres-Volberg, Bond-Volberg, and Laba-Zhai, and introduces new algebraic and number-theoretic methods to this area of research. The estimates are of interest in geometric measure theory, ergodic theory and analytic function theory.
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