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We have the following indirect implication of form equivalence classes:

242 \(\Rightarrow\) 241 given by the following sequence of implications, with a reference to its direct proof:

Implication	Reference
242 \(\Rightarrow\) 241	clear

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

Howard-Rubin Number	Statement
242:	There is, up to an isomorphism, at most one algebraic closure of \({\Bbb Q}\).
241:	Every algebraic closure of \(\Bbb Q\) has a real closed subfield.

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