Implications

We have the following indirect implication of form equivalence classes:

340 \(\Rightarrow\) 216
given by the following sequence of implications, with a reference to its direct proof:

Implication Reference
340 \(\Rightarrow\) 341 clear
341 \(\Rightarrow\) 10 note-158
10 \(\Rightarrow\) 216

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

Howard-Rubin Number Statement
340:

Every Lindelöf metric space is separable.

341:

Every Lindelöf metric space is second countable.

10:

\(C(\aleph_{0},< \aleph_{0})\):  Every denumerable family of non-empty finite sets has a choice function.

216:

Every infinite tree has either an infinite chain or an infinite antichain.

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