We have the following indirect implication of form equivalence classes:

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

Implication Reference
112 \(\Rightarrow\) 90 Equivalents of the Axiom of Choice II, Rubin/Rubin, 1985, page 79
90 \(\Rightarrow\) 91 The Axiom of Choice, Jech, 1973b, page 133

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

Howard-Rubin Number Statement
112:

\(MC(\infty,LO)\): For every family \(X\) of non-empty sets each of which can be linearly ordered there is a function \(f\) such that for all \(y\in X\), \(f(y)\) is a non-empty finite subset of \(y\).

90:

\(LW\):  Every linearly ordered set can be well ordered. Jech [1973b], p 133.

91:

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

Comment:

Back