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On the Nonexistence of Certain Normal Forms in the Logic of Provability

George Boolos
The Journal of Symbolic Logic
Vol. 47, No. 3 (Sep., 1982), pp. 638-640
DOI: 10.2307/2273593
Stable URL: http://www.jstor.org/stable/2273593
Page Count: 3
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On the Nonexistence of Certain Normal Forms in the Logic of Provability
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