ABSTRACT
The Po isson formula (2.2.1) is a key p r imary bu i ld ing block in risk
theory considerations. In section A.2(a) it is shown how it can be
deduced from quite general assumptions about its fundamental pro-
perties; i n section A.2(b) it is shown how the same formula can be
obtained as a l imi t ing expression of the b inomia l probabil i ty function.
(a) Individual approach. Cons ider a risk collective consisting of N
