SetMap.Projtype elt_a = A.elttype elt_b = B.elttype 'a map_a = 'a A.Map.ttype 'a map_b = 'a B.Map.tproj_map f init merge map is a map mapping each element b to the result of the itteration of the function merge over the image in map of the element a in f such that f(a)=b, starting with the element init.
partition_set f set is the map mapping any element b with an antecedent for f in the set set, into the set of its antecedents, ie to the set {a\in set | f(a)=b}.