We have the following indirect implication of form equivalence classes:
			
| Implication | Reference | 
|---|---|
| 8 \(\Rightarrow\) 353 | Disasters in metric topology without choice, Keremedis,  K. 2002, Comment. Math. Univ. Carolinae | 
Here are the links and statements of the form equivalence classes referenced above:
| Howard-Rubin Number | Statement | 
|---|---|
| 8: | \(C(\aleph_{0},\infty)\): | 
| 353: | A countable product of first countable spaces is first countable. | 
Comment: