Axiom Of Choice

We have the following indirect implication of form equivalence classes:

86-alpha \(\Rightarrow\) 26 given by the following sequence of implications, with a reference to its direct proof:

Implication	Reference
86-alpha \(\Rightarrow\) 8	clear
8 \(\Rightarrow\) 24	clear
24 \(\Rightarrow\) 26	Zermelo's Axiom of Choice, Moore, 1982, 66 Le¸cons sur la th´eorie des fonctions, Borel, [1898]

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

Howard-Rubin Number	Statement
86-alpha:	\(C(\aleph_{\alpha},\infty)\): If \(X\) is a set of non-empty sets such that \(\|X\| = \aleph_{\alpha }\), then \(X\) has a choice function.
8:	\(C(\aleph_{0},\infty)\):
24:	\(C(\aleph_0,2^{(2^{\aleph_0})})\): Every denumerable collection of non-empty sets each with power \(2^{(2^{\aleph_{0}})}\) has a choice function.
26:	\(UT(\aleph_{0},2^{\aleph_{0}},2^{\aleph_{0}})\): The union of denumerably many sets each of power \(2^{\aleph _{0}}\) has power \(2^{\aleph_{0}}\).

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