A note on the relationship between single- and multi-experiment observability for discrete-time nonlinear control systems.

The connection between the concepts of the single-experiment and the multi-experiment unobservability of a nonlinear discrete-time control system is studied. The main result claims that if the system is single-experiment unobservable and the observable space is integrable, then the system is also multi-experiment unobservable. For the proof of the main result a novel mathematical technique, the so-called algebra of functions, is used. [ABSTRACT FROM AUTHOR]