Department of Mathematics                          University of Haifa
 
                            Special Colloquium
 
Speaker: Dr. Yonatan Gutman
         Institut des Hautes Etudes Scientifiques
 
Topic:   A Juzvinskii Addition Theorem for Finitely Generated Free Group Actions
 
Date:    Friday, December 2, 2011
 
Place:   Room 614 of the Science & Education Building, University of Haifa
 
Time:    10:00 AM

                ==> Note special time and day!!! <===
 
                Abstract
 
The classical Juzvinskii Addition Theorem states that the entropy of an
automorphism of a compact group decomposes along invariant subgroups.
Thomas generalized the theorem to a skew-product setting. Using L.
Bowen's f-invariant we prove the addition theorem for actions of
finitely generated free groups on skew-products with compact totally
disconnected groups or finitely dimensional Lie groups. The proof uses
a Rokhlin-Abramov formula for the f-invariant. I will discuss examples.
Joint work with Lewis Bowen.
 
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Technion Math Net-2 (TECHMATH2)
Editor: Michael Cwikel   <techm@math.technion.ac.il> 
Announcement from: David Blanc   <blanc@math.haifa.ac.il>