We have the following indirect implication of form equivalence classes:
| Implication | Reference |
|---|---|
| 215 \(\Rightarrow\) 83 | clear |
| 83 \(\Rightarrow\) 64 | The Axiom of Choice, Jech, 1973b, page 52 problem 4.10 |
| 64 \(\Rightarrow\) 127 |
Amorphe Potenzen kompakter Raume, Brunner, N. 1984b, Arch. Math. Logik Grundlagenforschung |
Here are the links and statements of the form equivalence classes referenced above:
| Howard-Rubin Number | Statement |
|---|---|
| 215: | If \((\forall y\subseteq X)(y\) can be linearly ordered implies \(y\) is finite), then \(X\) is finite. |
| 83: | \(E(I,II)\) Howard/Yorke [1989]: \(T\)-finite is equivalent to finite. |
| 64: | \(E(I,Ia)\) There are no amorphous sets. (Equivalently, every infinite set is the union of two disjoint infinite sets.) |
| 127: | An amorphous power of a compact \(T_2\) space, which as a set is well orderable, is well orderable. |
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