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  1. On the set of 'meaningful' sentences of arithmetic.Aldo Ursini - 1978 - Studia Logica 37 (3):237 - 241.
    I give several characterizations of the set V₀ proposed in [3] as the set of meaningful and true sentences of first order arthimetic, and show that in Peano arithmetic the Σ₂ completeness of V₀ is provable.
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  • Logic of paradox revisited.Graham Priest - 1984 - Journal of Philosophical Logic 13 (2):153 - 179.
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  • Provability logics for natural Turing progressions of arithmetical theories.L. D. Beklemishev - 1991 - Studia Logica 50 (1):107 - 128.
    Provability logics with many modal operators for progressions of theories obtained by iterating their consistency statements are introduced. The corresponding arithmetical completeness theorem is proved.
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  • On the set of ‘Meaningful’ sentences of arithmetic.Aldo Ursini - 1978 - Studia Logica 37 (3):237-241.
    I give several characterizations of the set V₀ proposed in [3] as the set of meaningful and true sentences of first order arthimetic, and show that in Peano arithmetic the Σ₂ completeness of V₀ is provable.
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