  This paper calculates the degree of autonomy of a generic autonomous n-D
system given by the kernel of a partial difference operator. The calculation
implies that attaching a generic controller to a non-autonomous system, results
in a controlled system whose degree of autonomy is the maximum possible. Thus a
generic controller is maximally efficient with respect to the criterion of
maximising degree of autonomy. The term generic here refers to an open (dense)
subset of the set of all n-D systems with the Zariski topology.
