We have the following indirect implication of form equivalence classes:
| Implication | Reference |
|---|---|
| 354 \(\Rightarrow\) 32 |
Disasters in metric topology without choice, Keremedis, K. 2002, Comment. Math. Univ. Carolinae |
| 32 \(\Rightarrow\) 10 | clear |
| 10 \(\Rightarrow\) 288-n | clear |
| 288-n \(\Rightarrow\) 373-n | clear |
Here are the links and statements of the form equivalence classes referenced above:
| Howard-Rubin Number | Statement |
|---|---|
| 354: | A countable product of separable \(T_2\) spaces is separable. |
| 32: | \(C(\aleph_0,\le\aleph_0)\): Every denumerable set of non-empty countable sets has a choice function. |
| 10: | \(C(\aleph_{0},< \aleph_{0})\): Every denumerable family of non-empty finite sets has a choice function. |
| 288-n: | If \(n\in\omega-\{0,1\}\), \(C(\aleph_0,n)\): Every denumerable set of \(n\)-element sets has a choice function. |
| 373-n: | (For \(n\in\omega\), \(n\ge 2\).) \(PC(\aleph_0,n,\infty)\): Every denumerable set of \(n\)-element sets has an infinite subset with a choice function. |
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