Tel Aviv University Dear all, Next week we will hold the first regular meeting of the Horowitz seminar on Probability, Ergodic Theory and Dynamical Systems for the spring semester. We are happy to have: Speaker: Bryna Kra, Northwestern University Title: Rectangular tiling factors of R^d actions Date: Monday, March 4 Time: 14:30 Place: Schreiber 309 Abstract: We study the space of tilings of R^d for a collection of d-dimensional rectangles. Rudolph showed that there exist 2^d such tiles such that any free measure preserving R^d action has a tiling from this space as a factor map, and we show that d+1 tiles suffices. Furthermore, by studying the geometric properties of the tilings in R^2, we show that this result is sharp in two dimensions. This is joint work with A. Quas and A. Sahin. Best regards, Ron Seminar webpage: <http://www.math.tau.ac.il/~peledron/Horowitz_seminar/Horowitz_seminar.html> --------------------------------------------------------- Technion Math Net-2 (TECHMATH2) Editor: Michael Cwikel <techm@math.technion.ac.il> Announcement from: Ron Peled <peledron@post.tau.ac.il>