This previously announced lecture will not take place on 29/3/11. See a separate announcement of the colloquium which will replace it. Department of Mathematics University of Haifa COLLOQUIUM SPEAKER: Dr. Ziv Shami TOPIC: Categoricity and unidimensionality Abstract A countable first-order theory is said to be uncountably categorical if it has a unique model(up to isomorphism)in every uncountable cardinality. The class of unidimensional theories is a natural extension of the class of uncountably categorical theories. Geometric model theory has developed from categoricity theory: characterizations of categorical theories and some classifications of their pregeometries(matroids). The analysis of unidimensional theories has led to the development of new machinary in geometric model theory as well. --------------------------------------------------------- Technion Math Net-2 (TECHMATH2) Editor: Michael Cwikel <techm@math.technion.ac.il> Announcement from: <berger@math.haifa.ac.il>