Axiom Of Choice

We have the following indirect implication of form equivalence classes:

147 \(\Rightarrow\) 70 given by the following sequence of implications, with a reference to its direct proof:

Implication	Reference
147 \(\Rightarrow\) 91	The axiom of choice in topology, Brunner, N. 1983d, Notre Dame J. Formal Logic note-26
91 \(\Rightarrow\) 79	clear
79 \(\Rightarrow\) 70	clear

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

Howard-Rubin Number	Statement
147:	\(A(D2)\): Every \(T_2\) topological space \((X,T)\) can be covered by a well ordered family of discrete sets.
91:	\(PW\): The power set of a well ordered set can be well ordered.
79:	\({\Bbb R}\) can be well ordered. Hilbert [1900], p 263.
70:	There is a non-trivial ultrafilter on \(\omega\). Jech [1973b], prob 5.24.

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