This volume is the second of the three volume publication containing the
proceedings of the 1989 International Symposium on the Mathemat- ical
Theory of Networks and Systems (MTNS-89), which was held in Amsterdam,
The Netherlands, June 19-23, 1989 The International Symposia MTNS focus
attention on problems from system and control theory, circuit theory and
signal processing, which, in general, require application of
sophisticated mathematical tools, such as from function and operator
theory, linear algebra and matrix theory, differential and algebraic
geometry. The interaction between advanced mathematical methods and
practical engineering problems of circuits, systems and control, which
is typical for MTNS, turns out to be most effective and is, as these
proceedings show, a continuing source of exciting advances. The second
volume contains invited papers and a large selection of other symposium
presentations in the vast area of robust and nonlinear control. Modern
developments in robust control and H-infinity theory, for finite as well
as for infinite dimensional systems, are presented. A large part of the
volume is devoted to nonlinear control. Special atten- tion is paid to
problems in robotics. Also the general theory of nonlinear and infinite
dimensional systems is discussed. A couple of papers deal with problems
of stochastic control and filterina. vi Preface The titles of the two
other volumes are: Realization and Modelling in System Theory (volume 1)
and Signal Processing, Scattering and Operator Theory, and Numerical
Methods (volume 3).