We have the following indirect implication of form equivalence classes:

30 \(\Rightarrow\) 30
given by the following sequence of implications, with a reference to its direct proof:

Implication Reference
30 \(\Rightarrow\) 30 Über zwei Definitionen der Endlichkeit und G. Cantor’sche Sätze,, Schröder, E. 1898, Deutch. Akad. Naturforscher, nova Acta Leopoldina.

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

Howard-Rubin Number Statement
30:

Ordering Principle: Every set can be linearly ordered.

30:

Ordering Principle: Every set can be linearly ordered.

Comment:

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