Studia LogicaPub Date : 2024-02-17DOI: 10.1007/s11225-023-10083-0
Hitoshi Omori, Andreas Kapsner
{"title":"Angell and McCall Meet Wansing","authors":"Hitoshi Omori, Andreas Kapsner","doi":"10.1007/s11225-023-10083-0","DOIUrl":"https://doi.org/10.1007/s11225-023-10083-0","url":null,"abstract":"<p>In this paper, we introduce a new logic, which we call <b>AM3</b>. It is a connexive logic that has several interesting properties, among them being <i>strongly connexive</i> and validating the <i>Converse Boethius Thesis</i>. These two properties are rather characteristic of the difference between, on the one hand, Angell and McCall’s <b>CC1</b> and, on the other, Wansing’s <b>C</b>. We will show that in other aspects, as well, <b>AM3</b> combines what are, arguably, the strengths of both <b>CC1</b> and <b>C</b>. It also allows us an interesting look at how connexivity and the intuitionistic understanding of negation relate to each other. However, some problems remain, and we end by pointing to a large family of weaker logics that <b>AM3</b> invites us to further explore.</p>","PeriodicalId":48979,"journal":{"name":"Studia Logica","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139768159","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Studia LogicaPub Date : 2024-02-16DOI: 10.1007/s11225-023-10087-w
{"title":"Independence Results for Finite Set Theories in Well-Founded Locally Finite Graphs","authors":"","doi":"10.1007/s11225-023-10087-w","DOIUrl":"https://doi.org/10.1007/s11225-023-10087-w","url":null,"abstract":"<h3>Abstract</h3> <p>We consider all combinatorially possible systems corresponding to subsets of finite set theory (i.e., Zermelo-Fraenkel set theory without the axiom of infinity) and for each of them either provide a well-founded locally finite graph that is a model of that theory or show that this is impossible. To that end, we develop the technique of <em>axiom closure of graphs</em>.</p>","PeriodicalId":48979,"journal":{"name":"Studia Logica","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139773637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Studia LogicaPub Date : 2024-02-16DOI: 10.1007/s11225-023-10091-0
{"title":"Ecumenical Propositional Tableau","authors":"","doi":"10.1007/s11225-023-10091-0","DOIUrl":"https://doi.org/10.1007/s11225-023-10091-0","url":null,"abstract":"<h3>Abstract</h3> <p>Ecumenical logic aims to peacefully join classical and intuitionistic logic systems, allowing for reasoning about both classical and intuitionistic statements. This paper presents a semantic tableau for propositional ecumenical logic and proves its soundness and completeness concerning Ecumenical Kripke models. We introduce the Ecumenical Propositional Tableau (<span> <span>(E_T)</span> </span>) and demonstrate its effectiveness in handling mixed statements.</p>","PeriodicalId":48979,"journal":{"name":"Studia Logica","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139768212","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Studia LogicaPub Date : 2024-01-22DOI: 10.1007/s11225-023-10092-z
Jonas R. B. Arenhart, Hitoshi Omori
{"title":"On Woodruff’s Constructive Nonsense Logic","authors":"Jonas R. B. Arenhart, Hitoshi Omori","doi":"10.1007/s11225-023-10092-z","DOIUrl":"https://doi.org/10.1007/s11225-023-10092-z","url":null,"abstract":"<p>Sören Halldén’s logic of nonsense is one of the most well-known many-valued logics available in the literature. In this paper, we discuss Peter Woodruff’s as yet rather unexplored attempt to advance a version of such a logic built on the top of a constructive logical basis. We start by recalling the basics of Woodruff’s system and by bringing to light some of its notable features. We then go on to elaborate on some of the difficulties attached to it; on our way to offer a possible solution to such difficulties, we discuss the relation between Woodruff’s system and two-dimensional semantics for many-valued logics, as developed by Hans Herzberger.</p>","PeriodicalId":48979,"journal":{"name":"Studia Logica","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139515405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Studia LogicaPub Date : 2024-01-13DOI: 10.1007/s11225-023-10089-8
Victoria Arce Pistone, Martín Figallo
{"title":"Proof-Theoretic Aspects of Paraconsistency with Strong Consistency Operator","authors":"Victoria Arce Pistone, Martín Figallo","doi":"10.1007/s11225-023-10089-8","DOIUrl":"https://doi.org/10.1007/s11225-023-10089-8","url":null,"abstract":"<p>In order to develop efficient tools for automated reasoning with inconsistency (theorem provers), eventually making Logics of Formal inconsistency (<b>LFI</b>) a more appealing formalism for reasoning under uncertainty, it is important to develop the proof theory of the first-order versions of such <b>LFI</b>s. Here, we intend to make a first step in this direction. On the other hand, the logic <b>Ciore</b> was developed to provide new logical systems in the study of inconsistent databases from the point of view of <b>LFI</b>s. An interesting fact about <b>Ciore</b> is that it has a <i>strong</i> consistency operator, that is, a consistency operator which (forward/backward) propagates inconsistency. Also, it turns out to be an algebraizable logic (in the sense of Blok and Pigozzi) that can be characterized by means of a 3-valued logical matrix. Recently, a first-order version of <b>Ciore</b>, namely <b>QCiore</b>, was defined preserving the spirit of <b>Ciore</b>, that is, without introducing unexpected relationships between the quantifiers. Besides, some important model-theoretic results were obtained for this logic. In this paper we study some proof–theoretic aspects of both <b>Ciore</b> and <b>QCiore</b> respectively. In first place, we introduce a two-sided sequent system for <b>Ciore</b>. Later, we prove that this system enjoys the cut-elimination property and apply it to derive some interesting properties. Later, we extend the above-mentioned system to first-order languages and prove completeness and cut-elimination property using the well-known Shütte’s technique.</p>","PeriodicalId":48979,"journal":{"name":"Studia Logica","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139463990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Studia LogicaPub Date : 2024-01-09DOI: 10.1007/s11225-023-10090-1
Katsumi Sasaki, Yoshihito Tanaka
{"title":"An $$omega $$ -Rule for the Logic of Provability and Its Models","authors":"Katsumi Sasaki, Yoshihito Tanaka","doi":"10.1007/s11225-023-10090-1","DOIUrl":"https://doi.org/10.1007/s11225-023-10090-1","url":null,"abstract":"<p>In this paper, we discuss semantical properties of the logic <span>(textbf{GL})</span> of provability. The logic <span>(textbf{GL})</span> is a normal modal logic which is axiomatized by the the Löb formula <span>( Box (Box psupset p)supset Box p )</span>, but it is known that <span>(textbf{GL})</span> can also be axiomatized by an axiom <span>(Box psupset Box Box p)</span> and an <span>(omega )</span>-rule <span>((Diamond ^{*}))</span> which takes countably many premises <span>(phi supset Diamond ^{n}top )</span> <span>((nin omega ))</span> and returns a conclusion <span>(phi supset bot )</span>. We show that the class of transitive Kripke frames which validates <span>((Diamond ^{*}))</span> and the class of transitive Kripke frames which strongly validates <span>((Diamond ^{*}))</span> are equal, and that the following three classes of transitive Kripke frames, the class which validates <span>((Diamond ^{*}))</span>, the class which weakly validates <span>((Diamond ^{*}))</span>, and the class which is defined by the Löb formula, are mutually different, while all of them characterize <span>(textbf{GL})</span>. This gives an example of a proof system <i>P</i> and a class <i>C</i> of Kripke frames such that <i>P</i> is sound and complete with respect to <i>C</i> but the soundness cannot be proved by simple induction on the height of the derivations in <i>P</i>. We also show Kripke completeness of the proof system with <span>((Diamond ^{*}))</span> in an algebraic manner. As a corollary, we show that the class of modal algebras which is defined by equations <span>(Box xle Box Box x)</span> and <span>(bigwedge _{nin omega }Diamond ^{n}1=0)</span> is not a variety.</p>","PeriodicalId":48979,"journal":{"name":"Studia Logica","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139412978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Studia LogicaPub Date : 2024-01-09DOI: 10.1007/s11225-023-10088-9
{"title":"Nelson Conuclei and Nuclei: The Twist Construction Beyond Involutivity","authors":"","doi":"10.1007/s11225-023-10088-9","DOIUrl":"https://doi.org/10.1007/s11225-023-10088-9","url":null,"abstract":"<h3>Abstract</h3> <p>Recent work by Busaniche, Galatos and Marcos introduced a very general twist construction, based on the notion of <em>conucleus</em>, which subsumes most existing approaches. In the present paper we extend this framework one step further, so as to allow us to construct and represent algebras which possess a negation that is not necessarily involutive. Our aim is to capture the main properties of the largest class that admits such a representation, as well as to be able to recover the well-known cases—such as <em>(quasi-)Nelson algebras</em> and <em>(quasi-)N4-lattices</em>—as particular instances of the general construction. We pursue two approaches, one that directly generalizes the classical Rasiowa construction for Nelson algebras, and an alternative one that allows us to study twist-algebras within the theory of residuated lattices.</p>","PeriodicalId":48979,"journal":{"name":"Studia Logica","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139412983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Studia LogicaPub Date : 2024-01-06DOI: 10.1007/s11225-023-10067-0
{"title":"Combining Intuitionistic and Classical Propositional Logic: Gentzenization and Craig Interpolation","authors":"","doi":"10.1007/s11225-023-10067-0","DOIUrl":"https://doi.org/10.1007/s11225-023-10067-0","url":null,"abstract":"<h3>Abstract</h3> <p>This paper studies a combined system of intuitionistic and classical propositional logic from proof-theoretic viewpoints. Based on the semantic treatment of Humberstone (J Philos Log 8:171–196, 1979) and del Cerro and Herzig (Frontiers of combining systems: FroCoS, Springer, 1996), a sequent calculus <span> <span>(textsf{G}(textbf{C}+textbf{J}))</span> </span> is proposed. An approximate idea of obtaining <span> <span>(textsf{G}(textbf{C}+textbf{J}))</span> </span> is adding rules for classical implication on top of the intuitionistic multi-succedent sequent calculus by Maehara (Nagoya Math J 7:45–64, 1954). However, in the semantic treatment, some formulas do not satisfy heredity, which leads to the necessity of a restriction on the right rule for intuitionistic implication to keep the soundness of the calculus. The calculus <span> <span>(textsf{G}(textbf{C}+textbf{J}))</span> </span> enjoys cut elimination and Craig interpolation, whose detailed proofs are described in this paper. Cut elimination enables us to show the decidability of this combination both directly and syntactically. This paper also employs a canonical model argument to establish the strong completeness of Hilbert system <span> <span>(mathbf {C+J})</span> </span> proposed by del Cerro and Herzig (Frontiers of combining systems: FroCoS, Springer, 1996).</p>","PeriodicalId":48979,"journal":{"name":"Studia Logica","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139375740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Studia LogicaPub Date : 2023-12-09DOI: 10.1007/s11225-023-10085-y
Bruno Jacinto, Javier Belastegui
{"title":"Quineanism, Noneism and Metaphysical Equivalence","authors":"Bruno Jacinto, Javier Belastegui","doi":"10.1007/s11225-023-10085-y","DOIUrl":"https://doi.org/10.1007/s11225-023-10085-y","url":null,"abstract":"<p>In this paper we propose and defend the <i>Synonymy account</i>, a novel account of metaphysical equivalence which draws on the idea (Rayo in <i>The Construction of Logical Space</i>, Oxford University Press, Oxford, 2013) that part of what it is to formulate a theory is to lay down a theoretical hypothesis concerning logical space. Roughly, two theories are synonymous—and so, in our view, equivalent—just in case (i) they take the same propositions to stand in the same entailment relations, and (ii) they are committed to the truth of the same propositions. Furthermore, we put our proposal to work by showing that it affords a better and more nuanced understanding of the debate between Quineans and noneists. Finally we show how the <i>Synonymy account</i> fares better than some of its competitors, specifically, McSweeney’s (Philosophical Perspectives 30(1):270–293, 2016) epistemic account and Miller’s (Philosophical Quarterly 67(269):772–793, 2017) hyperintensional account.</p>","PeriodicalId":48979,"journal":{"name":"Studia Logica","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2023-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138561390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Studia LogicaPub Date : 2023-12-09DOI: 10.1007/s11225-023-10082-1
Heinrich Wansing, Hitoshi Omori
{"title":"Connexive Logic, Connexivity, and Connexivism: Remarks on Terminology","authors":"Heinrich Wansing, Hitoshi Omori","doi":"10.1007/s11225-023-10082-1","DOIUrl":"https://doi.org/10.1007/s11225-023-10082-1","url":null,"abstract":"<p>Over the past ten years, the community researching connexive logics is rapidly growing and a number of papers have been published. However, when it comes to the terminology used in connexive logic, it seems to be not without problems. In this introduction, we aim at making a contribution towards both unifying and reducing the terminology. We hope that this can help making it easier to survey and access the field from outside the community of connexive logicians. Along the way, we will make clear the context to which the papers in this special issue on <i>Frontiers of Connexive Logic</i> belong and contribute.</p>","PeriodicalId":48979,"journal":{"name":"Studia Logica","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2023-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138561509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}