We have the following indirect implication of form equivalence classes:

225 \(\Rightarrow\) 225
given by the following sequence of implications, with a reference to its direct proof:

Implication Reference
225 \(\Rightarrow\) 225

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

Howard-Rubin Number Statement
225:

Every proper filter on \(\omega\) can be extended to an ultrafilter.

225:

Every proper filter on \(\omega\) can be extended to an ultrafilter.

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