The composition of binary relations R_1 and R_2 is a relation R_3 such that R_1(x,y) and R_2(y,z) implies R_3(x,z).
(Nth-Domain Composition 3 Binary-Relation)
(Nth-Domain Composition 2 Binary-Relation)
(Nth-Domain Composition 1 Binary-Relation)
(=> (Composition ?R1 ?R2 ?R3)
(And (Binary-Relation ?R1)
(Binary-Relation ?R2)
(= ?R3
(Setofall (Listof ?X ?Z)
(Exists (?Y)
(And (Holds ?R1 ?X ?Y)
(Holds ?R2 ?Y ?Z)))))))