let F, H be ZF-formula; :: thesis: ( H is universal implies ( F is_immediate_constituent_of H iff F = the_scope_of H ) )
assume H is universal ; :: thesis: ( F is_immediate_constituent_of H iff F = the_scope_of H )
then H = All ((bound_in H),(the_scope_of H)) by Th44;
hence ( F is_immediate_constituent_of H iff F = the_scope_of H ) by Th54; :: thesis: verum