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We have the following indirect implication of form equivalence classes:

39 \(\Rightarrow\) 421 given by the following sequence of implications, with a reference to its direct proof:

Implication	Reference
39 \(\Rightarrow\) 8	clear
8 \(\Rightarrow\) 421	Unions and the axiom of choice, De-la-Cruz-Hall-Howard-Keremedis-Rubin-2002B[2002B], Math. Logic Quart.

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

Howard-Rubin Number	Statement
39:	\(C(\aleph_{1},\infty)\): Every set \(A\) of non-empty sets such that \(\vert A\vert = \aleph_{1}\) has a choice function. Moore, G. [1982], p. 202.
8:	\(C(\aleph_{0},\infty)\):
421:	\(UT(\aleph_0,WO,WO)\): The union of a denumerable set of well orderable sets can be well ordered.

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