Announcement for the second of TWO colloquium talks on Monday, January 10. Technion Mathematics Special Colloquium Title: Sieving in Orbits Speaker: Alex Kontorovich (Stony Brook University) Abstract We will discuss recent progress on the Affine Sieve, which aims to find primes or almost- primes in sets of integers generated by group actions. Topics include expanders, hyperbolic manifolds, the Apollonian gasket, prime entries in matrix groups, and Soddy^Òs spheres. Monday, January 10 4:30 p.m. Amado 232 Light refreshments will be served at 3:00pm at the faculty lounge on the 8th floor --------------------------------------------------------- Technion Math. Net (TECHMATH) Editor: Michael Cwikel <techm@math.technion.ac.il> Announcement from: Tamar Ziegler <tamarzr@techunix.technion.ac.il>