John Hunton (University of Leicester)
J.Hunton@mcs.le.ac.uk
The term Aperiodic Order has been coined to describe geometric phenomena such as the position of atoms in so-called 'quasicrystals', minerals whose atomic arrangements cannot form a classical periodic crystalline lattice, and yet which still have sufficient local order to display sharp Bragg peaks under X-ray scattering. Similar phenomena lie behind non-periodic tilings of the plane, such as Penrose's famous tiling by `kites' and `darts'. This talk will introduce the most important constructions of such aperiodically ordered patterns and various invariants (principally K-theoretic) that have been developed for describing their properties. Further details can be found on the web page
http://www.mcs.le.ac.uk/~jhunton/quasi.html