Individual is able to exist. A.Pair We ashume this Axiom Set u Hence {u} ma k So Set k Class k is Set, so it is possible to assume k is Obj Obj k −*− From T.1−1 ¬Obj u Hence ¬At {u} Hence ¬Cl k [A.Cl] From * Ind k
Where Class k which Atsumari {u} whose member is Universal class u makes is able to be Individual
[ A.*** ] means the Axiom *** is asumed
T.1−5 ∀y Set_ob
In Class Theory of this type, Ind and Obcl and Prcl are all Set. For example, Class r which is ¬Set has no relationship with it
Example of Class Theory of Type.1 ZF belongs to this type.