We have the following indirect implication of form equivalence classes:
			
| Implication | Reference | 
|---|---|
| 180 \(\Rightarrow\) 0 | 
Here are the links and statements of the form equivalence classes referenced above:
| Howard-Rubin Number | Statement | 
|---|---|
| 180: | Every Abelian group has a divisible hull. (If \(A\) and \(B\) are groups, \(B\) is a divisible hull of \(A\) means \(B\) is a divisible group, \(A\) is a subgroup of \(B\) and for every non-zero \(b \in B\), \(\exists n \in \omega \) such that \(0\neq nb\in A\).) Fuchs [1970], Theorem 24.4 p 107.  | 
					
| 0: | \(0 = 0\). | 
Comment: