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Effectiveness for infinite variable words and the Dual Ramsey Theorem

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We examine the Dual Ramsey Theorem and two related combinatorial principles VW(k,l) and OVW(k,l) from the perspectives of reverse mathematics and effective mathematics. We give a statement of the Dual Ramsey Theorem for open colorings in second order arithmetic and formalize work of Carlson and Simpson [1] to show that this statement implies ACA 0 over RCA 0 . We show that neither VW(2,2) nor OVW(2,2) is provable in WKL 0 . These results give partial answers to questions posed by Friedman and Simpson [3].

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References

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Correspondence to Joseph S. Miller.

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The first author’s research is partially supported by an NSF VIGRE Grant at Indiana University. The second author’s research is partially supported by an NSF Postdoctoral Fellowship.

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Miller, J., Solomon, R. Effectiveness for infinite variable words and the Dual Ramsey Theorem. Arch. Math. Logic 43, 543–555 (2004). https://doi.org/10.1007/s00153-004-0216-4

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