Implications

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We have the following indirect implication of form equivalence classes:

420 \(\Rightarrow\) 420 given by the following sequence of implications, with a reference to its direct proof:

Implication	Reference
420 \(\Rightarrow\) 420

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

Howard-Rubin Number	Statement
420:	\(UT(\aleph_0\),\(\aleph_0\),cuf): The union of a denumerable set of denumerable sets is cuf.
420:	\(UT(\aleph_0\),\(\aleph_0\),cuf): The union of a denumerable set of denumerable sets is cuf.

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