Axiom Of Choice

We have the following indirect implication of form equivalence classes:

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

Implication	Reference
406 \(\Rightarrow\) 10	The axiom of choice and two particular forms of Tychonoff theorem, Alas, O. T. 1969, Portugal. Math.
10 \(\Rightarrow\) 216

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

Howard-Rubin Number	Statement
406:	The product of compact Hausdorf spaces is countably compact. Alas [1994].
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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