When it does happen, we are content to call it "chance." Or we have been persuaded. There do exist levels where chance is hardly recognized at all. But to the likes of employees such as Roger Mexico it is music, not without its majesty, this power series
, terms numbered according to
occurring within a given time interval.
[The formula for the Poisson probability mass function is
space for which |D|, the area or volume of the region, is finite, and if N(D) is count of the number of events in D, then
P(N(D)=k)=\frac{(\lambda|D|)^k e^{-\lambda|D|}}{k!} . ]
rocketfalls per square, the Poisson dispensation ruling not only these annihilations no man can run from, but also cavalry accidents, blood counts, radioactive decay, number of wars per year. . . .