=== Base Template !RelativeComplementOf2Classes ===

[[br]]!RelativeComplementOf2Classes is a template for expressing that a class is the relative complement of two classes. 
[[br]]
[[br]]!RelativeComplementOf2Classes(a, b, c) means that c is the relative complement of a and b. 
[[br]]
[[br]]Roles: 
[[br]]1 hasClass1 Class 
[[br]]2 hasClass2 Class 
[[br]]3 hasClassRelativeComplement Class 

Axiom: 
{{{
RelativeComplementOf2Classes(x1, x2, x3) <-> 
Class(x1) & 
Class(x2) & 
Class(x3) & 
exists y(DifferenceOf2Classes(x1, x2, y) & 
IntersectionOf2Classes(x1, y, x3)) . 
}}}

NOTE The relative complement of two classes a and b is commonly written anb. See 8.3 for further information on the representation used in this template.