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Effectively Retractable Theories and Degrees of Undecidability
J. P. Jones
The Journal of Symbolic Logic
Vol. 34, No. 4 (Dec., 1969), pp. 597-604
Published by: Association for Symbolic Logic
DOI: 10.2307/2270853
Stable URL: http://www.jstor.org/stable/2270853
Page Count: 8
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The Journal of Symbolic Logic © 1969 Association for Symbolic Logic