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We have the following indirect implication of form equivalence classes:

79 \(\Rightarrow\) 251 given by the following sequence of implications, with a reference to its direct proof:

Implication	Reference
79 \(\Rightarrow\) 251	consequence of the axiom of choice, Ash, C. J. 1975, J. Austral. Math. Soc. Ser. A.

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

Howard-Rubin Number	Statement
79:	\({\Bbb R}\) can be well ordered.  Hilbert [1900], p 263.
251:	The additive groups \(({\Bbb R},+)\) and \(({\Bbb C},+)\) are  isomorphic.

Comment: