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Reverse mathematics and Ramsey's property for trees

Published online by Cambridge University Press:  12 March 2014

Jared Corduan ,
Marcia J. Groszek  and
Joseph R. Mileti
Jared Corduan
Affiliation:
6188 Kemeny Hall, Dartmouth College, Hanover, Nh 03755-3551, USA. E-mail: [email protected]
Marcia J. Groszek
Affiliation:
6188 Kemeny Hall, Dartmouth College, Hanover, Nh 03755-3551, USA. E-mail: [email protected]
Joseph R. Mileti
Affiliation:
Department of Mathematics and Statistics, Grinnell College, Grinnell, Ia 50112-1690, USA. E-mail: [email protected]
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Abstract

We show, relative to the base theory RCA0: A nontrivial tree satisfies Ramsey's Theorem only if it is biembeddable with the complete binary tree. There is a class of partial orderings for which Ramsey's Theorem for pairs is equivalent to ACA0. Ramsey's Theorem for singletons for the complete binary tree is stronger than . hence stronger than Ramsey's Theorem for singletons for ω. These results lead to extensions of results, or answers to questions, of Chubb, Hirst, and McNicholl [3].

Type
Research Article
Information
The Journal of Symbolic Logic , Volume 75 , Issue 3 , September 2010 , pp. 945 - 954
Copyright
Copyright © Association for Symbolic Logic 2010

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References

REFERENCES

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