We have the following indirect implication of form equivalence classes:
| Implication | Reference |
|---|---|
| 331 \(\Rightarrow\) 332 |
Topologie, Analyse Nonstandard et Axiome du Choix, Morillon, M. 1988, Universit\'e Blaise-Pascal |
| 332 \(\Rightarrow\) 343 |
Topologie, Analyse Nonstandard et Axiome du Choix, Morillon, M. 1988, Universit\'e Blaise-Pascal |
| 343 \(\Rightarrow\) 62 | clear |
| 62 \(\Rightarrow\) 283 |
The well-ordered and well-orderable subsets of a set, Truss, J. K. 1973d, Z. Math. Logik Grundlagen Math. |
Here are the links and statements of the form equivalence classes referenced above:
| Howard-Rubin Number | Statement |
|---|---|
| 331: | If \((X_i)_{i\in I}\) is a family of compact non-empty topological spaces then there is a family \((F_i)_{i\in I}\) such that \(\forall i\in I\), \(F_i\) is an irreducible closed subset of \(X_i\). |
| 332: | A product of non-empty compact sober topological spaces is non-empty. |
| 343: | A product of non-empty, compact \(T_2\) topological spaces is non-empty. |
| 62: | \(C(\infty,< \aleph_{0})\): Every set of non-empty finite sets has a choice function. |
| 283: | Cardinality of well ordered subsets: For all \(n\in\omega\) and for all infinite \(x\), \(|x^n| < |s(x)|\) where \(s(x)\) is the set of all well orderable subsets of \(x\). |
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