Mathematics Preprints 2005
05.05 : PORTER, T.
What `shape' is space-time?
Summary:Some examples from the mathematics of shape are presented that question some of the almost hidden assumptions behind results on limiting behaviour of finitary approximations to space-time. These are presented so as to focus attention on the observational problem of refinement and suggest the necessity for an alternative theory of `fractafolds' against which the limiting theory of C^\infty-differential manifolds usually underlying (quantum) general relativity can be measured.
05.19 : BAK, A., BROWN, R., MINIAN, G. & PORTER, T.
Groupoid atlases: an introduction