We have the following indirect implication of form equivalence classes:

80 \(\Rightarrow\) 80
given by the following sequence of implications, with a reference to its direct proof:

Implication Reference
80 \(\Rightarrow\) 80 On the principle of dependent choices, Mostowski, A. 1948, Fund. Math.

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

Howard-Rubin Number Statement
80:

\(C(\aleph_{0},2)\):  Every denumerable set of  pairs has  a  choice function.

80:

\(C(\aleph_{0},2)\):  Every denumerable set of  pairs has  a  choice function.

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