## Pure Mathematics Seminars

**2nd May 2006 **

Christophe Ritzenthaler (Marseille),

"Where are the Jacobians ?"

**9th May 2006 **

Tom Sanders (Cambridge)
"Additive structures and sumsets"

**16th May 2006 **

ROOM C229 !!

Sean Murphy (RHUL),

"The Independence of Linear Approximations in Symmetric
Cryptology"

**23rd May 2006 **

Mark Watkins (Bristol),
" Heuristics for counting elliptic curves"

Abstract: We give some heuristics for counting elliptic curves, that is,
equations of the form Y^2=X^3+aX+b. First we indicate how many
curves there should be with discriminant 4a^3+27b^2 bounded by
a parameter T. Then we start to add extra conditions, such as
requiring the elliptic curve to have a point (X,Y) with
"small" coordinates, or to have non-trivial torsion subgroup, etc.

**30th May 2006 **

John Talbot (UCL).

"Turan's problem for hypergraphs"

**ALL WELCOME !**

This page lists this term's Pure Mathematics Seminars. All are welcome.
All seminars will take place in the McCrea Building, Room 219, at 4.00pm,
unless stated otherwise. Tea is served before the seminar at 3.30 in Room
237 of the McCrea Building.