In the natural world we are surrounded by large highly ordered structures that are assembled out of minute entities (atoms). How Nature accomplishes this is largely unknown. The simplest and by far the most common system is the periodic repetition of some basic motive. These are crystals. We now know that there are solid-state materials that are crystallographic in almost every way, including long-range order that rivals in perfection with that found in crystals, which are most definitely not periodic. In this lecture, we will discuss some of the mathematics that is being used to model these quasi-crystals, its unexpected origins, and the lovely way in which it weaves together various diverse disciplines of mathematics.
Suivant la conférence, une réception a eu lieu au salon Maurice-L'Abbé.
After the lecture, a reception was held in the Maurice-L'Abbé salon.
Faites un clic sur une photo en format réduit afin de la voir à ses dimensions réelles. (50 à 70 Ko chaque photo)
Click on one of the reduced size photos in order to see it full size. (50-70 Kb for each photo)
Photographe: Réjean Meloche
5 octobre 1998, webmaster@CRM.UMontreal.CA