We have the following indirect implication of form equivalence classes:

37 \(\Rightarrow\) 38
given by the following sequence of implications, with a reference to its direct proof:

Implication Reference
37 \(\Rightarrow\) 38 L’axiome de M. Zermelo et son rˆole dans la th´eorie des ensembles et l’analyse, Sierpi'nski, W. 1918, Bull. Int. Acad. Sci. Cracovie Cl. Math. Nat.

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

Howard-Rubin Number Statement
37:

Lebesgue measure is countably additive.

38:

\({\Bbb R}\) is not the union of a countable family of countable sets.

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