Base Template UnionOf2Classes
UnionOf2Classes is a template for expressing that a class is the union of two classes.
UnionOf2Classes(a, b, c) means that a, b, and c are classes, and that c is the union of a
and b.
Roles:
1 hasClass1 Class
2 hasClass2 Class
3 hasClassUnion Class
Axiom:
UnionOf2Classes(x1, x2, x3) <-> Class(x1) & Class(x2) & Class(x3) & exists y(EnumeratedSetOf2Classes(x1, x2, y) & UnionOfSetOfClassTemplate(y, x3)) .
NOTE See 8.3 for further information on the representation used in this template.