We have the following indirect implication of form equivalence classes:

91 \(\Rightarrow\) 91
given by the following sequence of implications, with a reference to its direct proof:

Implication Reference
91 \(\Rightarrow\) 91 The Axiom of Choice, Jech, 1973b, page 133
Equivalents of the Axiom of Choice II, Rubin-Rubin, [1985]

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

Howard-Rubin Number Statement
91:

\(PW\):  The power set of a well ordered set can be well ordered.

91:

\(PW\):  The power set of a well ordered set can be well ordered.

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