Algebraic Computing in Control : Proceedings of the First European Conference Paris March 13 15 1991 Some algebraic combinatorial and algebraic differential me thods have beenused in recent years in order to solve many problems in control theory by effective algorithms. Imple mentation of these algorithms generally involves algebraic computation systems and tools. Software realizations are al ready developed in an increasing number of research centres. The goal of the First European Conference on Algebraic Com puting in Control has been to present the main actual me thods for analysis and control of systems which naturally lead to the use of algebraic computing. The maintopics and themes are as follows: mathematic tools in control theory that lead to effective algorithms algebraic computing tools that are available in the field of control theory software realizations in control involving algebraic computing