### Base Template RelativeComplementOf2Classes

RelativeComplementOf2Classes is a template for expressing that a class is the relative complement of two classes.

RelativeComplementOf2Classes(a, b, c) means that c is the relative complement of a and b.

Roles:

1 hasClass1 Class

2 hasClass2 Class

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.