Journal of Mathematical Logic 13 (2):1350007 (2013)

Abstract
In recent years, there has been a substantial amount of work in reverse mathematics concerning natural mathematical principles that are provable from RT, Ramsey's Theorem for Pairs. These principles tend to fall outside of the "big five" systems of reverse mathematics and a complicated picture of subsystems below RT has emerged. In this paper, we answer two open questions concerning these subsystems, specifically that ADS is not equivalent to CAC and that EM is not equivalent to RT.
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DOI 10.1142/s0219061313500074
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References found in this work BETA

Primitive Recursion and the Chain Antichain Principle.Alexander P. Kreuzer - 2012 - Notre Dame Journal of Formal Logic 53 (2):245-265.

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Ramsey-Type Graph Coloring and Diagonal Non-Computability.Ludovic Patey - 2015 - Archive for Mathematical Logic 54 (7-8):899-914.
Degrees Bounding Principles and Universal Instances in Reverse Mathematics.Ludovic Patey - 2015 - Annals of Pure and Applied Logic 166 (11):1165-1185.
Reverse Mathematical Bounds for the Termination Theorem.Silvia Steila & Keita Yokoyama - 2016 - Annals of Pure and Applied Logic 167 (12):1213-1241.
Constructing Sequences One Step at a Time.Henry Towsner - forthcoming - Journal of Mathematical Logic.

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