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Filtration Safe Operations on Frames
P. 333–352.
Kikot S., Shapirovsky I., Zolin E.
Filtration is a standard tool for establishing the finite model property of modal logics. We consider logics and classes of frames that admit filtration, and identify some operations on them that preserve this property. In particular, the operation of adding the inverse or the transitive closure of a relation is shown to be safe in this sense. These results are then used to prove that every regular grammar logic with converse admits filtration. We present filtration constructions for right-linear and left-linear grammar logics. We also give a simple example of a grammar modal logic that is undecidable and hence does not admit filtration.
Rybakov M., Annals of Pure and Applied Logic 2026 Vol. 177 No. 10 Article 103811
The paper presents a solution to the question about the decidability of the two-variable fragment of the superintuitionistic predicate logic QLC defined by the class of linear Kripke frames, which is also the ‘superintuitionistic’ fragment of the modal predicate logic QS4.3, under the Gödel translation. We prove that the fragment is undecidable. The result remains true for the ...
Added: July 11, 2026
Shehtman V. B., Gagarin A., , in: Graph Games and Logic Design. Recent Developments and Further Directions. (TREN, volume 66)Vol. 66.: Springer, 2026. Ch. 17 P. 419–450.
The chapter contains an overview of results on products of propositional modal logics and related constructions: semiproducts, Segerberg squares, and others. We focus mainly on axiomatizations, finite model property, and decidability; we also sketch connections with classical and modal predicate logics. In some cases we give ideas of proofs, especially of those using games. ...
Added: June 30, 2026
Springer, 2026.
This book presents established and new research on the close connections between graph games and systems of logic, particularly existing and newly designed modal logics. The volume utilizes two graph games – the sabotage game and the hide-and-seek game – to demonstrate the natural interplay between designing new graph games and exploring new kinds of ...
Added: June 30, 2026
Onoprienko A., Математические заметки 2026 Т. 120 № 1 С. 118–139
This paper considers the intuitionistic epistemic logics IEL−, IEL, and IEL+, introduced by S. Artyomov and T. Protopopescu. A translation of the formulas of these logics into the formulas of the classical bimodal logic S4V−M, S4VM, S4V+M, and S4V+MU is constructed. This translation is a generalization of Gödel's translation of intuitionistic logic into S4 logic. ...
Added: June 22, 2026
Speranski S. O., Вестник Новосибирского государственного университета. Серия: Математика, механика, информатика 2011 Т. 11 № 4 С. 78–93
В настоящей статье изучаются вычислительные аспекты формального требования максимальной специфичности, накладываемого на правила в языке пропозициональной классической логики, когда над этим языком задана вычислимая рационально-значная вероятностная мера. Доказана неразрешимость ряда общих проблем по обнаружению максимально специфичных правил и вероятностных мер, для которых совокупность всех специфичных правил вычислима; установлена разрешимость множества максимально специфичных правил при неких ...
Added: December 27, 2025
Speranski S. O., Алгебра и логика 2011 Т. 50 № 4 С. 533–546
Язык для рассуждений о вероятности обобщается за счёт добавления в него кванторов по пропозициональным формулам. Далее рассматриваются соответствующие вопросы разрешимости. В частности, представленные результаты демонстрируют неразрешимость проблемы общезначимости для довольно слабого фрагмента нового языка. С другой стороны, устанавливается разрешимость ограниченной проблемы общезначимости для АЕ-предложений. ...
Added: December 27, 2025
Speranski S. O., Journal of Logic and Computation 2013 Vol. 23 No. 5 P. 1035–1055
In the present article, the quantifiers over propositions are first introduced into the language for reasoning about probability, then the complexity issues for validity problems dealing with the corresponding hierarchy of probabilistic sentences are investigated. We prove, among other things, the $\Pi^1_1$-completeness for the general validity and also indicate the least level in the hierarchy ...
Added: December 27, 2025
Speranski S. O., Archive for Mathematical Logic 2013 Vol. 52 No. 5–6 P. 507–516
We carry out a study of definability issues in the standard models of Presburger and Skolem arithmetics (henceforth referred to simply as Presburger and Skolem arithmetics, for short, because we only deal with these models, not the theories, thus there is no risk of confusion) supplied with free unary predicates — which are strongly related to definability in ...
Added: December 27, 2025
Грефенштейн А. В., Speranski S. O., Математический сборник 2024 Т. 215 № 3 С. 37–69
Разрабатывается кванторная версия пропозициональной модальной логики BK из статьи С. П. Одинцова и Х. Вансинга, в основе которой лежит (немодальная) система Белнапа–Данна; мы будем обозначать эту версию через QBK. Сначала с помощью метода канонических моделей будет доказано, что QBK — как и некоторые важные её расширения — сильно полна относительно подходящей семантики возможных миров. Затем мы ...
Added: December 26, 2025
Speranski S. O., Izvestiya. Mathematics 2025 Vol. 89 No. 3 P. 193–211
Let QPL-e expand the quantifier-free ‘polynomial’ probability logic of [Fagin et al. 1990] by adding quantifiers over arbitrary events; it can be viewed as a one-sorted elementary language for reasoning about probability spaces. We prove that the $\Sigma_2$-fragment of the QPL-e-theory of finite spaces is hereditarily undecidable. By earlier observations, this implies that $\Pi_2$ is the ...
Added: December 26, 2025
Speranski S. O., Logic Journal of the IGPL 2025 Vol. 33 No. 2 Article jzae042
This paper is concerned with a two-sorted probabilistic language, denoted by QPL, which contains quantifiers over events and over reals, and can be viewed as an elementary language for reasoning about probability spaces. The fragment of QPL containing only quantifiers over reals is a variant of the well-known ‘polynomial’ language from [Fagin et al. 1990, Section 6]. ...
Added: December 26, 2025
Kudinov A., Shapirovsky I., Studia Logica 2025 P. 1–25
We study the finite model property of subframe logics with expressible transitive
reflexive closure modality. For m > 0, let Lm be the logic defined by axiom ♦^{m+1}p →
♦p ∨ p. We construct quotient filtrations for the logics Lm, which implies that these logics
and their tense counterparts have the finite model property. Then, we construct selective
filtrations ...
Added: October 14, 2025
Kudinov A., Мясников К. М., Математика и теоретические компьютерные науки 2025 Т. 3 № 2 С. 58–84
The paper proves that for weakly transitive logics with the universal modality, whose formula satisfiability problem is in PSPACE, adding the connectedness axiom does not increase the complexity. Furthermore, an explicit algorithm solving this problem is presented. ...
Added: October 14, 2025
Rybakov M., Щербаков М. И., В кн.: Четырнадцатые Смирновские чтения по логике: материалы Междунар. науч. конф., Москва, 19-21 июня 2025 г.: М.: Издатель Александр Воробьев, 2025. С. 46–49.
Логики с аксиомой конвергентности: сложность при малом числе переменных в языке ...
Added: June 21, 2025
Kudinov A., Rybakov M., В кн.: Четырнадцатые Смирновские чтения по логике: материалы Междунар. науч. конф., Москва, 19-21 июня 2025 г.: М.: Издатель Александр Воробьев, 2025. С. 36–39.
Показано, что каждая модальная логика, содержащая классическую логику высказываний и содержащаяся в слабой логике Гжегорчика, имеет NP-трудную проблему выполнимости для константного фрагмента. В частности, константные фрагменты ненормальных модальных логик E, EM, EN и EMN являются coNP-полными. ...
Added: June 21, 2025
[б.и.], 2024.
The book contains short papers presented at AiML 2024. ...
Added: August 15, 2024
College Publications, 2024.
Advances in Modal Logic (AiML) is an initiative founded in 1995 and aimed at presenting an up-to-date picture of the state of the art in modal logic and its many applications. It consists of a conference series together with volumes based on the conferences. The conference series is the main international forum at which research ...
Added: August 14, 2024
Rybakov M., Shkatov D., Studia Logica 2025 Vol. 113 P. 1–48
In the early 1960s, to prove undecidability of monadic fragments of sublogics of the predicate modal logic QS5 that include the classical predicate logic QCl, Saul Kripke showed how a classical atomic formula with a binary predicate letter can be simulated by a monadic modal formula. We consider adaptations of Kripke's simulation, which we call the Kripke trick, to various modal ...
Added: December 2, 2023