This volume contains the proceedings of a conference held in Wiirzburg,
August 20-24, 1990. The theme of the conference was Bifurcation and
Chaos: Analysis, Algorithms, Ap- plications. More than 100 scientists
from 21 countries presented 80 contributions. Many of the results of the
conference are described in the 49 refereed papers that follow. The
conference was sponsored by the Deutsche Forschungsgemeinschaft, and by
the Deutscher Akademischer Austauschdienst. We gratefully acknowledge
the support from these agen- cies. The science of nonlinear phenomena is
evolving rapidly. Over the last 10 years, the emphasis has been
gradually shifting. How trends vary may be seen by comparing these
proceedings with previous ones, in particular with the conference held
in Dortmund 1986 (proceedings published in ISNM 79). Concerning the
range of phenomena, chaos has joined the bifurcation scenarios. As
expected, the acceptance of chaos is less emotional among professionals,
than it has been in some popular publications. A nalytical methods
appear to have reached a state in which basic results of singularities,
symmetry groups, or normal forms are everyday experience rather than
exciting news. Similarly, numerical algorithms for frequent situations
are now well established. Implemented in several packages, such
algorithms have become standard means for attacking nonlinear problems.
The sophisti- cation that analytical and numerical methods have reached
supports the vigorous trend to more and more applications. Pioneering
equations as those named after Duffing, Van der Pol, or Lorenz, are no
longer exclusively the state of art.