We investigate hypercyclic and chaotic behavior of linear strongly continuous semigroups. We give necessary and sufficient conditions on the semigroup to be hypercyclic, and sufficient conditions on the spectrum of an operator to generate a hypercyclic semigroup. A variety of examples is provided.(Received March 6 1995)
(Revised February 21 1996)
Work by G. W. supported by the National Science Foundation under Grant No. DMS-9202550. Work by W. D. done within the Spezialforschungsbereich F 003, Optimierung und Kontrolle. Work by W. D. and W. S. supported in part by a SCIENCE project of the European Community.