Implications

We have the following indirect implication of form equivalence classes:

68 \(\Rightarrow\) 210
given by the following sequence of implications, with a reference to its direct proof:

Implication Reference
68 \(\Rightarrow\) 210 clear

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.

210:

The commutator subgroup of a free group is free.

Comment:

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