From topological covers to algebraic numbers

Florian Pop

University of Penselvania

Northeastern University

Thursday, February 10, 2005


Talk at 4:30 p.m. in 509 Lake Hall

Tea at 4:00 p.m. in 544 Nightingale Hall

Abstract:   In his "Esquisse d'un Programme" Grothendieck suggests that one should try to study the Galois structure of the rational numbers via arithmetic actions on geometric fundamental groups. And finally be able to describe Galois groups of number fields in a pure topological and combinatorial way. In my talk I will elaborate on these ideas and present some known results.

Here are some directions to Northeastern University. Lake Hall and Nightingale Hall can be best accessed from the entrance on the corner of Greenleaf Street and Leon Street. The two halls are connected, with no well-defined boundary in between. In particular, 509 Lake Hall is on the same corridor as 544 Nightingale Hall.

There is free parking available for people coming to the Colloquium at Northeastern's visitor parking (Rennaisance Garage). The entrance is from Columbus Avenue. If coming by car, you should park there and take the parking talon. After the lecture, you may pick up the payment coupon from Maxim Braverman.