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We have the following indirect implication of form equivalence classes:

251 \(\Rightarrow\) 93 given by the following sequence of implications, with a reference to its direct proof:

Implication	Reference
251 \(\Rightarrow\) 93	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
251:	The additive groups \(({\Bbb R},+)\) and \(({\Bbb C},+)\) are  isomorphic.
93:	There is a non-measurable subset of \({\Bbb R}\).

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