We have the following indirect implication of form equivalence classes:

321 \(\Rightarrow\) 321
given by the following sequence of implications, with a reference to its direct proof:

Implication Reference
321 \(\Rightarrow\) 321

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

Howard-Rubin Number Statement
321:

There does not exist an ordinal \(\alpha\) such that \(\aleph_{\alpha}\) is weakly compact and \(\aleph_{\alpha+1}\) is measurable.

321:

There does not exist an ordinal \(\alpha\) such that \(\aleph_{\alpha}\) is weakly compact and \(\aleph_{\alpha+1}\) is measurable.

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