Implications

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We have the following indirect implication of form equivalence classes:

68 \(\Rightarrow\) 68 given by the following sequence of implications, with a reference to its direct proof:

Implication	Reference
68 \(\Rightarrow\) 68	The Axiom of Choice, Jech, 1973b, page 12

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

Howard-Rubin Number	Statement
68:	Nielsen-Schreier Theorem: Every subgroup of a free group is free.  Jech [1973b], p 12.
68:	Nielsen-Schreier Theorem: Every subgroup of a free group is free.  Jech [1973b], p 12.

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