We have the following indirect implication of form equivalence classes:

231 \(\Rightarrow\) 231
given by the following sequence of implications, with a reference to its direct proof:

Implication Reference
231 \(\Rightarrow\) 231

Here are the links and statements of the form equivalence classes referenced above:

Howard-Rubin Number Statement
231:

\(UT(WO,WO,WO)\): The union of a well ordered collection of well orderable sets is well orderable.

231:

\(UT(WO,WO,WO)\): The union of a well ordered collection of well orderable sets is well orderable.

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