Studia Logica 103 (3):559-578 (2015)

Abstract
We investigate the “unprovability of unprovability”. Given a sentence P and a fixed base theory T, the unprovability of P is the sentence “\ ”. We show that the unprovability of an unprovable true sentence can be “hard to prove”
Keywords Unprovability  Provability degrees
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DOI 10.1007/s11225-014-9579-7
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Degrees of Relative Provability.Mingzhong Cai - 2012 - Notre Dame Journal of Formal Logic 53 (4):479-489.

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