“…Various other names have been used for them (and slight variations thereof) over the years: monotone measures, non-additive measures, capacities, etc. (see, e.g., [39,40,57,58,62,96]). But the essential feature, namely, for nonnegative set functions to drop any form of additivity and to replace it by the (usually weaker) monotonicity (and the vanishing in the empty set) was a significant step toward a generalization of the theory of measures.…”