Property (v), total monotony (also called complete monotony or infinite monotony), is a one-sided weakening of the inclusion–exclusion
formula of probability measures. When working with capacities, the inner continuity condition (iv) is usually
relaxed by assuming Ω to be a topological space and demanding it only for open sets instead of all measurable sets. That will
make no difference to our argument, though, since both counterexamples satisfy (iv) in the more restrictive sense above.
The complement of an event A ∈ A will be denoted by A
c
. The indicator function of A will be denoted by IA.
Events {Ai}i∈I are called independent (