## About these proceedings

### Introduction

This volume contains the proceedings of the conference
"state and Frequency Domain Approaches to
Infinite-Dimensional Systems". The aim was to bring together
engineers and mathematicians working in the field of linear
infinite-dimensional systems who are specialists in one or
more of the following categories of mathematical approaches:
semigroup approches,p.d.e. approaches, frequency domain
approaches and syntheses of state-space and frequency domain
approaches. Since these approaches use very different
sophisticated mathematical techniques, it is unusual for a
scientist to be expert in all of them. On the other hand,
there different approaches all purport to address the same
control problems for the same classes of linear
infinite-dimensional systems. It is therefore important to
compare and discuss the advantages and disadvantages of
these different mathematical techniques. To help ameliorate
the communication gab a series of introductory tutorial
lectures were given by specialists in the above-mentioned
fields. There were complemented by some key survey papers on
more recent research, as well as by papers representing
original research in these areas.

### Keywords

Regelungstheorie Schrödinger equation calculus communication control control theory game theory hyperbolic equation model modeling optimization robust control stability stabilization wave equation

### Bibliographic information