Non–commutative dynamical systems with chaos
presented at Quantum Probability Conference, March 29–April 3, 1993, Nottingham, U.K.
This paper is written in memorian Alberto Frigerio as a modest tribute to this man of great scientific discipline.
We give a review of the properties of quantum characteristic exponents and show that this recently introduced notion can be considered as an indicator of chaos for non-commutative dynamical systems.