Given two (or more) classifiers, evaluate whether they are disjoint. Disjointness checks between more than two classes, if necessary, must be clear about the implementation (i.e., pairwise or overall disjointness).

areDisjoint(classifierA : Classifier, classifierB : Classifier): boolean;
areDisjoint(...classifiers : Classifier[]): boolean;
arePairwiseDisjoint(...classifiers : Classifier[]): boolean;