COLUMBIA UNIVERSITY - Department of Mathematics

Working Seminar - Trees and Related Topics: (N. Benakli, Y. Glasner, S. Mokhtari-Sharghi)
Yair Glasner
"Arithmeticity of the commensurator of an arithmetic lattice in a product of two trees" - 4:00 p.m., 507 Math.

Number Theory: (D. Goldfeld, H. Jacquet, S.W. Zhang)
Winnie Li (Penn State)
"Character sums and automorphic forms" - 5:30 p.m., 507 Math. Tea will be served at 5:00 p.m., 508 Math.

New York Seminar on Geometry and Physics: (B. Greene)
Calin Lazaroiu (Physics, Columbia)
"D-branes and quantum geometry: Part III of IV" - 11:00 a.m., 705 Pupin.

Applied Mathematics Colloquim: (C.K. Chu), jointly sponsored by the Applied Mathematics Division, Applied Physics Department and the Department of Mathematics
Igor Krichever (Columbia Math.)
"Soliton theory and applications" - 4:30 p.m., 312 Math. Tea will be served at 4:00 p.m., 508 Math.

Geometry and Analysis: (M. Kuranishi, D.H. Phong)
NO SEMINAR THIS WEEK.

Algebraic Geometry: (R. Friedman)
Sorin Popescu - "Deformations of Calabi-Yau 3-folds-Part II" - 1:10 p.m., 405 Math.

Geometric Topology: (J. Birman, B. Mangum)
Hugh Morton (Liverpool)
"The multivariable Alexander polynomial and Fiedler's invariant forclosed braids"
1:00 p.m., 417 Math.

Geometric Topology: (J. Birman, B. Mangum)
Ted Stanford (U.S. Naval Academy, Annapolis)
"Vassiliev invariants and the lower central series of pure braid groups"
2:15-3:45 p.m., 417 Math.

Working Seminar-Syzygies and Geometry: (D. Bayer, H. Pinkham, S. Popescu)
Lev Borisov
"A combinatorial proof of the Castelnuovo-Eisenbud-Goto regularity bound for toric curves"
3:00 p.m., 507 Math.