This volume consists of six articles, each treating an important topic
in the theory ofthe Navier-Stokes equations, at the research level. Some
of the articles are mainly expository, putting together, in a unified
setting, the results of recent research papers and conference lectures.
Several other articles are devoted mainly to new results, but present
them within a wider context and with a fuller exposition than is usual
for journals. The plan to publish these articles as a book began with
the lecture notes for the short courses of G.P. Galdi and R. Rannacher,
given at the beginning of the International Workshop on Theoretical and
Numerical Fluid Dynamics, held in Vancouver, Canada, July 27 to August
2, 1996. A renewed energy for this project came with the founding of the
Journal of Mathematical Fluid Mechanics, by G.P. Galdi, J. Heywood, and
R. Rannacher, in 1998. At that time it was decided that this volume
should be published in association with the journal, and expanded to
include articles by J. Heywood and W. Nagata, J. Heywood and M. Padula,
and P. Gervasio, A. Quarteroni and F. Saleri. The original lecture notes
were also revised and updated.