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In our previous work, we proposed the logic obtained from full non-associative Lambek calculus by adding a sort of linear-logical modality. We call this logic non-associative non-commutative intuitionistic linear logic ($\mathbf{NACILL}$,…

Logic · Mathematics 2020-03-04 Hiromi Tanaka

We show that the variety of modal lattices has the superamalgamation property. As a consequence, we obtain that the weak positive modal logic has the Craig interpolation property. Our proof employs the recent duality for modal lattices…

Logic · Mathematics 2026-03-17 Rodrigo Nicolau Almeida , Nick Bezhanishvili , Simon Lemal

We show that there is a restriction, or modification of the finite-variable fragments of First Order Logic in which a weak form of Craig's Interpolation Theorem holds, but a strong form of this theorem does not hold. Translating these…

Logic · Mathematics 2007-05-23 Gabor Sagi , Saharon Shelah

Using polyadic MV algebras, we show that many predicate many valued logics have the interpolation property.

Logic · Mathematics 2013-04-04 Tarek Sayed Ahmed

We provide the first (non-labelled) sequent calculi for bimodal provability logics with "usual" provability predicates. In particular, we introduce calculi for the logics CS, CSM and ER. Additionally, we present non-wellfounded versions of…

Logic · Mathematics 2026-05-15 Borja Sierra Miranda , Thomas Studer

We show that Propositional Dynamic Logic (PDL) has the Craig Interpolation Property. This question has been open for many years. Three proof attempts were published, but later criticized in the literature or retracted. Our proof is based on…

Logic in Computer Science · Computer Science 2025-03-18 Manfred Borzechowski , Malvin Gattinger , Helle Hvid Hansen , Revantha Ramanayake , Valentina Trucco Dalmas , Yde Venema

We focus on the persistence principle over weak interpretability logic. Our object of study is the logic obtained by adding the persistence principle to weak interpretability logic from several perspectives. Firstly, we prove that this…

Logic · Mathematics 2023-10-03 Sohei Iwata , Taishi Kurahashi , Yuya Okawa

In \cite{Craig}, we introduced a syntactically defined and highly general class of calculi known as \emph{semi-analytic}. We then demonstrated that any sufficiently strong (modal) substructural logic with a semi-analytic calculus must…

Logic in Computer Science · Computer Science 2025-06-27 Amirhossein Akbar Tabatabai , Raheleh Jalali

Traditionally, research on Craig interpolation is concerned with (a) establishing the Craig interpolation property (CIP) of a logic saying that every valid implication in the logic has a Craig interpolant and (b) designing algorithms that…

Logic in Computer Science · Computer Science 2025-12-04 Agi Kurucz , Frank Wolter , Michael Zakharyaschev

In a previous work we introduced a non-associative non-commutative logic extended by multimodalities, called subexponentials, licensing local application of structural rules. Here, we further explore this system, exhibiting a classical…

Logic in Computer Science · Computer Science 2023-08-11 Eben Blaisdell , Max Kanovich , Stepan L. Kuznetsov , Elaine Pimentel , Andre Scedrov

We study the fixed point property and the Craig interpolation property for sublogics of the interpretability logic $\mathbf{IL}$. We provide a complete description of these sublogics concerning the uniqueness of fixed points, the fixed…

Logic · Mathematics 2020-08-07 Sohei Iwata , Taishi Kurahashi , Yuya Okawa

This chapter presents a state-of-the-art survey of relationships, traditionally referred to as `bridges', between interpolation properties for propositional logics -- including superintuitionistic, modal, and substructural logics -- and…

Logic · Mathematics 2025-12-02 George Metcalfe

In this chapter, we present six different proofs of Craig interpolation for the modal logic K, each using a different set of techniques (model-theoretic, proof-theoretic, syntactic, automata-theoretic, using quasi-models, and algebraic). We…

Logic in Computer Science · Computer Science 2025-11-25 Nick Bezhanishvili , Balder ten Cate , Rosalie Iemhoff

In this chapter we give a basic overview of known results regarding Craig interpolation for first-order logic as well as for fragments of first-order logic. Our aim is to provide an entry point into the literature on interpolation theorems…

Logic in Computer Science · Computer Science 2025-10-07 Balder ten Cate , Jesse Comer

In a previous work we introduced a non-associative non-commutative logic extended by multimodalities, called subexponentials, licensing local application of structural rules. Here, we further explore this system, considering a classical…

Logic in Computer Science · Computer Science 2023-07-24 Eben Blaisdell , Max I. Kanovich , Stepan L. Kuznetsov , Elaine Pimentel , Andre Scedrov

Craig's Interpolation theorem has a wide range of applications, from mathematical logic to computer science. Proof-theoretic techniques for establishing interpolation usually follow a method first introduced by Maehara for the Sequent…

Logic in Computer Science · Computer Science 2026-03-04 Meven Lennon Bertrand , Alexis Saurin

In this paper we introduce Commutative/Non-Commutative Logic (CNC logic) and two categorical models for CNC logic. This work abstracts Benton's Linear/Non-Linear Logic by removing the existence of the exchange structural rule. One should…

Logic in Computer Science · Computer Science 2019-04-16 Jiaming Jiang , Harley Eades , Valeria de Paiva

We introduce Craig interpolation and related notions such as uniform interpolation, Beth definability, and theory decomposition in classical propositional logic. We present four approaches to computing interpolants: via quantifier…

Logic in Computer Science · Computer Science 2026-02-24 Patrick Koopmann , Christoph Wernhard , Frank Wolter

Recent research has established complexity results for the problem of deciding the existence of interpolants in logics lacking the Craig Interpolation Property (CIP). The proof techniques developed so far are non-constructive, and no…

Logic in Computer Science · Computer Science 2026-05-20 Jean Christoph Jung , Jędrzej Kołodziejski , Frank Wolter

This paper shows that the interpolation theorem fails in the intuitionistic logic of constant domains. This result refutes two previously published claims that the interpolation property holds.

Logic · Mathematics 2015-04-13 Grigori Mints , Grigory Olkhovikov , Alasdair Urquhart