Thu, 20 Jan 2005
14:00
14:00
Comlab
Mon, 21 Feb 2005
14:15
14:15
DH 3rd floor SR
Characterisation of paths by their signatures
Dr Nadia Sidorova
(Oxford)
Abstract
It is known that a continuous path of bounded variation
can be reconstructed from a sequence of its iterated integrals (called the signature) in a similar way to a function on the circle being reconstructed from its Fourier coefficients. We study the radius of convergence of the corresponding logarithmic signature for paths in an arbitrary Banach space. This convergence has important consequences for control theory (in particular, it can be used for computing the logarithm of a flow)and the efficiency of numerical approximations to solutions of SDEs. We also discuss the nonlinear structure of the space of logarithmic signatures and the problem of reconstructing a path by its signature.
Mon, 14 Feb 2005
12:00
12:00
L3
Tree amplitudes for six, seven and eight gluons.
Abstract: New calculations in the twistor diagram formalism show that non-MH
Andrew Hodges
(Oxford)
Tue, 01 Mar 2005
17:00
17:00
L1