Tue, 28 Feb 2017

12:00 - 13:15
L4

### Critical L-values from multi-loop Feynman diagrams

(Open University)
Abstract

I shall report on recent progress, in Australia and Germany, on the empirical evaluation of special values of L-functions by minors of period matrices whose elements include Feynman integrals from diagrams with up to 20 loops. Previously such relations were known only for diagrams with up to 6 loops.

Fri, 21 Nov 2014

14:30 - 15:45
L2

### The History of Mathematics in 300 Stamps

Robin Wilson
(Open University)
Abstract

The entire history of mathematics in one hour, as illustrated by around 300 postage stamps featuring mathematics and mathematicians from across the world.

From Euclid to Euler, from Pythagoras to Poincaré, and from Fibonacci to the Fields Medals, all are featured in attractive, charming and sometimes bizarre stamps. No knowledge of mathematics or philately required.

Tue, 23 Oct 2012
17:00
L2

### The width of a group

Nick Gill
(Open University)
Abstract

I describe recent work with Pyber, Short and Szabo in which we study the width' of a finite simple group. Given a group G and a subset A of G, the width of G with respect to A' - w(G,A) - is the smallest number k such that G can be written as the product of k conjugates of A. If G is finite and simple, and A is a set of size at least 2, then w(G,A) is well-defined; what is more Liebeck, Nikolov and Shalev have conjectured that in this situation there exists an absolute constant c such that w(G,A)\leq c log|G|/log|A|.
I will present a partial proof of this conjecture as well as describing some interesting, and unexpected, connections between this work and classical additive combinatorics. In particular the notion of a normal K-approximate group will be introduced.

Tue, 14 Feb 2012

17:00 - 18:37
L3

### Conformal automorphisms of countably connected domains

Ian Short
(Open University)
Tue, 05 May 2009

17:00 - 18:00
L3

### The structure of the escaping set in complex dynamics

Gwyneth Stallard
(Open University)
Mon, 18 Oct 2004
17:00
L1

### Universal singular sets

Toby O'Neil
(Open University)
Tue, 14 Oct 2003
17:00
L3

### Dimension of visible sets in the plane

Toby O'Neil
(Open University)
Subscribe to Open University