Physics Colloquium:
Gordon Kane (Michigan and IAS)
"String theory and the real world"
4:15 p.m., 428 PUPIN HALL

Informal Symplectic Geometry: (C. Manolescu, D. McDuff, P. Ozsváth)
Tim Perutz
"Lagrangian correspondences for fibered four-manifolds, part 1"
5:30 p.m., 507 Math

Workshop on Elliptic and Parabolic Geometric PDE
Thursday, October 4 and Friday, October 5, 2007
Organizers:  Huaidong Cao, P. Daskalopoulos, R. Hamilton and S.T. Yau
2:45-5:30 p.m., Thursday talks are in 507 Mathematics Building

Geometry/Analysis Seminar: (Z. Hou, N. Sesum)
Alan Weinstein (UC Berkeley)
"Groupoid symmetry for Einstein's equations?"
4:30 p.m., 507 Math.

Joint COLUMBIA-CUNY-NYU (Rotating among the 3 Universities)
Number Theory (D. Goldfeld, V. Kolyvagin,  L. Szpiro, Y. Tschinkel,  A. Venkatesh,  S. Zhang, )
Bjorn Poonen (UC, Berkeley)
"Existence of rational points on smooth projective varieties"
Columbia University,  312  Math, 5:30-7:00 p.m., Tea will be served in the Math Lounge, Room 508, 5:00 p.m.

FRIDAY, OCTOBER 5

Workshop on Elliptic and Parabolic Geometric PDE
Thursday, October 4 and Friday, October 5, 2007
Organizers:  Huaidong Cao, P. Daskalopoulos, R. Hamilton and S.T. Yau
10:00 a.m. -4:30 p.m., Friday talks are in 520 Mathematics Building

Probability: (I. Karatzas)
No Seminar This Week.

Symplectic Geometry and Gauge Theory: (C. Manolescu, D. McDuff, M. Khovanov, P.S. Ozsváth, R. Lipshitz)
Kevin Costello (Northwestern)
"Perturbative Chern-Simons theory"
1:00 p.m., 507 Math.

Geometric Topology:  (D. Thurston)
Jason Behrstock
"Quasi-isometric rigidity of mapping class groups"
2:15 p.m., 507 Math.

Algebraic Geometry: (J. de Jong, M. Thaddeus, J. Ross)
Danny Gillam
"The crepant resolution conjecture for an involution of 3d flags"
2:15 p.m., 417 Math.

Samuel Eilenberg Lectures:
Yakov Eliashberg (Stanford & Columbia)
“Symplectic topology of affine complex manifolds"
3:30 p.m., 312 Math.
Tea will be served at 3:00 p.m., 508 Math.