## General Mathematics Colloquium

07Oct2015 11:15 - 12:15

Event

Speaker: Peter Stevenhagen (Leiden University)

Title: Number fields and their invariants

Abstract:

Mathematicians often attach invariants' to the objects they encounter, and a general question is then to which extent these
invariants characterize' the objects in question.
We will discuss such questions in the context of number fields, and see in the end that the techniques enabling us to construct number fields with the same absolute abelian Galois group' are also useful in showing that elliptic curves over a number field essentially all have the same' adelic point group.

Location: KdVI meeting room, Science Park 105-107, F3.20