| On the proof of Solovay's theorem, Studia Logica, 50, pp. 51--70. D. H. J. de Jongh and F. Montagna |
....recognize reasoning about more complex notions like interpretability where arithmetic can be shown to reason adequately, and also to strengthen Solovay s results directly. Extensive overviews on the subject can be found in Boolos [1993b] and Smory nski [1985] a short history in Boolos and Sambin [1991]. Let us proceed somewhat farther in formulating Solovay s theorems, and call an arithmetic realization of the language of modal logic (see section 2) into the language of the arithmetic theory T ( Sigma 1 sound and extending I Sigma 1 , sometimes I Delta 0 ) a mapping that commutes with the ....
....be valid in all transitive models of ZF , which happens to be a proper extension of L (see Boolos [1993b] If one is somewhat careful, Solovay s construction can be adapted to show that Solovay s theorems hold for all (r.e. sound) extensions of I Delta 0 EXP (de Jongh, Jumelet and Montagna [1991]) The two theorems formulated earlier in this section can be similarly generalized. However, the most intriguing question, whether 488 G. Japaridze and D. de Jongh Solovay s theorems hold for essentially weaker theories, such as Buss s S 1 2 or even S 2 , remains open. This problem was ....
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On the proof of Solovay's theorem, Studia Logica, 50, pp. 51--70. D. H. J. de Jongh and F. Montagna
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, On the canonicity of Sahlqvist identities, Studia Logica, vol. 53 (1994), pp. 473--491.
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, On the canonicity of Sahlqvist identities, Studia Logica, vol. 53 (1994), pp. 473--491.
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On the proof of Solovay's theorem, Studia Logica, 50, pp. 51--70. D. H. J. de Jongh and F. Montagna
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'On Universal Algebraic Construction of Logics', Studia Logica 36, 9-47. H. Andréka & I. Németi
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