Kai Bruennler, Alessio Guglielmi
In this note we will show how to get consistency for first order classical logic, in a purely syntactic way, without going through cut elimination. The procedure is very simple and it uses the calculus of structures in an essential way. It also shows how finitaryness (in the sense of finite choice of premises for each rule) is actually a triviality (contrarily to what one would guess from textbooks).
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
继续探索
In this paper we give a terminating cut-elimination procedure for a logic calculus SBL. SBL corresponds to the second order arithmetic Pi^{1}_{2}-Separation and Bar Induction.
We present a sequent calculus for the modal Grzegorczyk logic Grz allowing non-well-founded proofs and obtain the cut-elimination theorem for it by constructing a continuous cut-elimination mapping acting on these proofs.
In this paper we show that the intuitionistic theory for finitely many iterations of strictly positive operators is a conservative extension of the Heyting arithmetic. The proof is inspired by the quick cut-elimination due to G. Mints. This technique is also applied to fragments of Heyting arithmetic.
We present a sequent calculus for the weak Grzegorczyk logic Go allowing non-well-founded proofs and obtain the cut-elimination theorem for it by constructing a continuous cut-elimination mapping acting on these proofs.
The $ε$-substitution method is a technique for giving consistency proofs for theories of arithmetic. We use this technique to give a proof of the consistency of the impredicative theory $ID_1$ using a variant of the cut-elimination formalism introduced by Mints.
Semantical cut-elimination for the provability logic of true arithmetic
本文针对形式化算术真理的可证性逻辑GLS，引入其语义刻画并给出了切消定理的语义证明，该刻画可推广至其他拟正规模态逻辑。
This paper is intended to provide an introduction to cut elimination which is accessible to a broad mathematical audience. Gentzen's cut elimination theorem is not as well known as it deserves to be, and it is tied to a lot of interesting mathematical structure. In particular we try to indicate some dynamical and combinatorial aspects of cut elimination, as well as its connections to complexity theory. We discuss two concrete examples where one can see the structure of short proofs with cuts, one concerning feasible numbers and the other concerning "bounded mean oscillation" from real analysis…
We develop a Gentzen-style proof theory for super-Belnap logics (extensions of the four-valued Dunn-Belnap logic), expanding on an approach initiated by Pynko. We show that just like substructural logics may be understood proof-theoretically as logics which relax the structural rules of classical logic but keep its logical rules as well as the rules of Identity and Cut, super-Belnap logics may be seen as logics which relax Identity and Cut but keep the logical rules as well as the structural rules of classical logic. A generalization of the cut elimination theorem for classical propositional l…
In this paper we calibrate the strength of the soundness of a Kripke-Platek set theory with the axioms of Infinity and Π_{1}-Collection with the assumption that`there exists an uncountable regular ordinal' in terms of the existence of ordinals.
Let $R$ be an o-minimal expansion of a group in a language in which $\textrm{Th}(R)$ eliminates quantifiers, and let $C$ be a predicate for a valuational cut in $R$. We identify a condition that implies quantifier elimination for $\textrm{Th}(R,C)$ in the language of $R$ expanded by $C$ and a small number of constants, and which, in turn, is implied by $\textrm{Th}(R,C)$ having quantifier elimination and being universally axiomatizable. The condition applies for example in the case when $C$ is a convex subring of an o-minimal field $R$ and its residue field is o-minimal.
We associate to every proof structure in multiplicative linear logic an ideal which represents the logical content of the proof as polynomial equations. We show how cut-elimination in multiplicative proof nets corresponds to instances of the Buchberger algorithm for computing Gröbner bases in elimination theory.
Cut elimination for a non-wellfounded system for the master modality
本文扩展了先前在非良基证明中消去切的方法，将其应用于基于简单迹条件的证明，通过将系统拆分为无限多个局部进度演算，实现了仅用结构证明理论和互递归的切消去，并应用于带主模态的模态逻辑系统 $K^+$。
Normalization and cut-elimination theorems for some logics of evidence and truth
本文研究证据与真理逻辑LETJ和LETF的证明论，通过构建自然演绎与矢列系统并证明规范化与切消定理，得出这两种逻辑的可判定性。
Any set of truth-functional connectives has sequent calculus rules that can be generated systematically from the truth tables of the connectives. Such a sequent calculus gives rise to a multi-conclusion natural deduction system and to a version of Parigot's free deduction. The elimination rules are "general," but can be systematically simplified. Cut-elimination and normalization hold. Restriction to a single formula in the succedent yields intuitionistic versions of these systems. The rules also yield generalized lambda calculi providing proof terms for natural deduction proofs as in the Curr…
In this Part I, we shall prove the consistency of arithmetic without complete induction from a point of view of strong negation, using its embedding to the tableau system $\bf SN$ of constructive arithmetic with strong negation without complete induction, for which two types of cut elimination theorems hold. One is $\bf SN$-cut elimination theorem for the full system $\bf SN$. The other is $\bf PCN$-cut elimination theorem for a proposed subsystem $\bf PCN$ of $\bf SN$. The disjunction property and the E-theorem (existence property) for $\bf SN$ are also proved. As a novelty, we shall give a s…
On the Cut Elimination of Weak Intuitionistic Tense Logic
本文提出一种通过分裂收缩规则和切割规则来证明弱直觉时态逻辑切割消去的新方法，并展望其未来理论扩展与应用。
The paper studies a cluster of systems for fully disquotational truth based on the restriction of initial sequents. Unlike well-known alternative approaches, such systems display both a simple and intuitive model theory and remarkable proof-theoretic properties. We start by showing that, due to a strong form of invertibility of the truth rules, cut is eliminable in the systems via a standard strategy supplemented by a suitable measure of the number of applications of truth rules to formulas in derivations. Next, we notice that cut remains eliminable when suitable arithmetical axioms are added …
In "Cut Elimination for Gentzen's Sequent Calculus with Equality and Logic of Partial Terms" LNCS 7750,161-172(2013), we have shown that the cut rule is eliminable in two ground equational sequent calculi, to be denoted by EQ_M and EQ'. In this note we prove that the contraction rule is not eliminable in EQ_M but it is eliminable in EQ'.
We show how Leibnitz.s indiscernibility principle and Gentzen's original work lead to extensions of the sequent calculus to first order logic with equality and investigate the cut elimination property. Furthermore we discuss and improve the nonlengthening property of Lifshitz and Orevkov.
The failure of cut-elimination in cyclic proof for first-order logic with inductive definitions
本文证明带归纳定义的一阶逻辑循环证明系统中切割消除不成立，通过构造一个必须依赖切割规则才能证明的相继式实例，证实了该系统无法消除切割的猜想。
Cut elimination for Cyclic Proofs: A Case Study in Temporal Logic
本文为扩展了“最终”时序算子的模态逻辑的循环矢列演算提供切消过程，将归约切消方法适配至循环演算，能直接将循环证明转化为无切循环证明而无需正则化机制。
We present a cut elimination argument that witnesses the conservativity of the compositional axioms for truth (without the extended induction axiom) over any theory interpreting a weak subsystem of arithmetic. In doing so we also fix a critical error in Halbach's original presentation. Our methods show that the admission of these axioms determines a hyper-exponential reduction in the size of derivations of truth-free statements.
A new calculus for intuitionistic Strong Löb logic: strong termination and cut-elimination, formalised
本文为直觉主义强Löb逻辑提出新相继式演算，实现强终止的向后搜索与句法消割，并在Coq中形式化验证。
Cut elimination for the alternation-free modal mu-calculus
本文为模态μ-演算的无交替片段提出一种基于循环证明系统的语法切消去过程，利用多切和良拟序理论直接将带切证明转换为无切证明并保证终止。
We show that if a theory R defined by a rewrite system is super-consistent, the classical sequent calculus modulo R enjoys the cut elimination property, which was an open question. For such theories it was already known that proofs strongly normalize in natural deduction modulo R, and that cut elimination holds in the intuitionistic sequent calculus modulo R. We first define a syntactic and a semantic version of Friedman's A-translation, showing that it preserves the structure of pseudo-Heyting algebra, our semantic framework. Then we relate the interpretation of a theory in the A-translated a…
The paper presents a cut-elimination procedure for intuitionistic propositional logic in which cut is eliminated directly, without introducing the multiple-cut rule mix, and in which pushing cut above contraction is one of the reduction steps. The presentation of this procedure is preceded by an analysis of Gentzen's mix-elimination procedure, made in the perspective of permuting cut with contraction. It is also shown that in the absence of implication, pushing cut above contraction doesn't pose problems for directly eliminating cut.
Proof schemata are a variant of LK-proofs able to simulate various induction schemes in first-order logic by adding so called proof links to the standard first-order LK-calculus. Proof links allow proofs to reference proofs thus giving proof schemata a recursive structure. Unfortunately, applying reductive cut- elimination is non-trivial in the presence of proof links. Borrowing the concept of lazy instantiation from functional programming, we evaluate proof links locally allowing reductive cut-elimination to proceed past them. Though, this method cannot be used to obtain cut-free proof schema…
A study of cut-elimination for a non-labelled cyclic proof system for propositional dynamic logics
本文研究了命题动态逻辑中非标记循环证明系统的消去问题，提出了序数演算和循环证明系统，并证明了其正确性和完备性，同时展示了消去失败及限制后的消去性质。
In this paper we present a constructive proof of cut elimination for a system of full second order logic with the structural rules absorbed and using sets instead of sequences. The standard problem of the cutrank growth is avoided by using a new parameter for the induction, the cutweight. This technique can also be applied to first order logic.
Rule-Elimination Theorems
该研究针对传统切消去定理证明算法化、结构晦涩的问题，在泛逻辑框架下抽象考察规则，给出LK命题片段切消去定理的非算法证明，定义正规与抽象相继式结构并证明对应的规则消去定理及部分逆定理，揭示消去定理的本质。
A study for recovering the cut-elimination property in cyclic proof systems by restricting the arity of inductive predicates
本文研究循环证明系统中消切性质失效的原因，证明即使将语言限制为一元归纳谓词和一元函数，消切性质在简单循环证明系统中仍不成立，改进了先前需三元谓词的反例。
This paper employs the linear nested sequent framework to design a new cut-free calculus LNIF for intuitionistic fuzzy logic--the first-order Gödel logic characterized by linear relational frames with constant domains. Linear nested sequents--which are nested sequents restricted to linear structures--prove to be a well-suited proof-theoretic formalism for intuitionistic fuzzy logic. We show that the calculus LNIF possesses highly desirable proof-theoretic properties such as invertibility of all rules, admissibility of structural rules, and syntactic cut-elimination.
$Ω$-rule was introduced by W. Buchholz to give an ordinal-free cut-elimination proof for a subsystem of analysis with $Π^{1}_{1}$-comprehension. His proof provides cut-free derivations by familiar rules only for arithmetical sequents. When second-order quantifiers are present, they are introduced by $Ω$-rule and some residual cuts are not eliminated. Using an extension of $Ω$-rule we obtain (by the same method as W. Buchholz) complete cut-elimination: any derivation of arbitrary sequent is transformed into its cut-free derivation by the standard rules (with induction replaced by $ω$-rule). W. …
This paper presents proof nets for multiplicative-additive linear logic (MALL), called conflict nets. They are efficient, since both correctness and translation from a proof are p-time (polynomial time), and abstract, since they are invariant under transposing adjacent &-rules. A conflict net on a sequent is concise: axiom links with a conflict relation. Conflict nets are a variant of (and were inspired by) combinatorial proofs introduced recently for classical logic: each can be viewed as a maximal map (homomorphism) of contractible coherence spaces (P_4-free graphs, or cographs), from axioms…
Cut elimination for propositional cyclic proof systems with fixed-point operators
本文研究带不动点算子或归纳定义的命题循环证明系统，证明其与无穷式系统可证明性等价，并因此具有无切割完备性。
The logic of bunched implications (BI) is a substructural logic that forms the backbone of separation logic, the much studied logic for reasoning about heap-manipulating programs. Although the proof theory and metatheory of BI are mathematically involved, the formalization of important metatheoretical results is still incipient. In this paper we present a self-contained formalized, in the Coq proof assistant, proof of a central metatheoretical property of BI: cut elimination for its sequent calculus. The presented proof is *semantic*, in the sense that is obtained by interpreting sequents in a…
The Lambek calculus can be considered as a version of non-commutative intuitionistic linear logic. One of the interesting features of the Lambek calculus is the so-called "Lambek's restriction," that is, the antecedent of any provable sequent should be non-empty. In this paper we discuss ways of extending the Lambek calculus with the linear logic exponential modality while keeping Lambek's restriction. Interestingly enough, we show that for any system equipped with a reasonable exponential modality the following holds: if the system enjoys cut elimination and substitution to the full extent, t…
We present a sequent calculus for the Grzegorczyk modal logic Grz allowing cyclic and other non-well-founded proofs and obtain the cut-elimination theorem for it by constructing a continuous cut-elimination mapping acting on these proofs. As an application, we establish the Lyndon interpolation property for the logic Grz proof-theoretically.
On structural proof theory of the modal logic K+ extended with infinitary derivations
本文研究模态逻辑K+在加入无穷推导后的结构证明论，提出允许非良基证明的矢列演算，并利用连续切割消去方法证明切割消去定理，同时说明K+的普通证明可视为循环无切割证明。
In previous work, an attempt was made to apply the schematic CERES method [8] to a formal proof with an arbitrary number of Π 2 cuts (a recursive proof encapsulating the infinitary pigeonhole principle) [5]. However the derived schematic refutation for the characteristic clause set of the proof could not be expressed in the formal language provided in [8]. Without this formalization a Herbrand system cannot be algorithmically extracted. In this work, we provide a restriction of the proof found in [5], the ECA-schema (Eventually Constant Assertion), or ordered infinitary pigeonhole principle, w…
The biggest challenge in hybrid systems verification is the handling of differential equations. Because computable closed-form solutions only exist for very simple differential equations, proof certificates have been proposed for more scalable verification. Search procedures for these proof certificates are still rather ad-hoc, though, because the problem structure is only understood poorly. We investigate differential invariants, which define an induction principle for differential equations and which can be checked for invariance along a differential equation just by using their differential…
This paper explores the connection between two central results in the proof theory of classical logic: Gentzen's cut-elimination for the sequent calculus and Herbrands "fundamental theorem". Starting from Miller's expansion-tree-proofs, a highly structured way presentation of Herbrand's theorem, we define a calculus of weakening-free proof nets for (prenex) first-order classical logic, and give a weakly-normalizing cut-elimination procedure. It is not possible to formulate the usual counterexamples to confluence of cut-elimination in this calculus, but it is nonetheless nonconfluent, lending c…
We present a sequent calculus system for a modal reformulation of a system of nonmonotonic logic due to McCain and Turner: we prove cut elimination for our system. The proof system is in general infinitary: because we can prove cut elimination, many applications need, in practice, only the application of finitary rules. Consequently, nonmonotonic logic is, in many cases, much less scary than it might seem to be a priori. We derive from this a critique of Fodor's philosophical worries about the nonmonotonicity of human reasoning.
Display calculi are generalized sequent calculi which enjoy a `canonical' cut elimination strategy. That is, their cut elimination is uniformly obtained by verifying the assumptions of a meta-theorem, and is preserved by adding or removing structural rules. In the present paper, we discuss a proof-theoretic setting, inspired both to Belnap's Display Logic and to Sambin's Basic Logic, which generalises these calculi in two directions: by explicitly allowing different types, and by weakening the so-called display and visibility properties. The generalisation to a multi-type environment makes it …
Nested Sequents for Intuitionistic Multi-Modal Logics: Cut-Elimination and Lyndon Interpolation
本文提出了一种单结论嵌套序列表演算，用于直觉多模逻辑，并证明了切消性和Lyndon插值性质。
Cut-elimination is one of the most famous problems in proof theory, and it was defined and solved for first-order sequent calculus by Gentzen in his celebrated Hauptsatz. Ceres is a different cut-elimination algorithm for first- and higher-order classical logic. Ceres was extended to proof schemata, which are templates for usual first-order proofs, with parameters for natural numbers. However, while Ceres is known to be a complete cut-elimination algorithm for first-order logic, it is not clear whether this holds for first-order schemata too: given in input a proof schema with cuts, does Ceres…
Herbrand's Theorem in Refutation Schemata
针对含归纳证明的消去切问题，本文提出模式替换框架与归结模式合一算法，以构造反驳并提取表示 Herbrand 相继式的 Herbrand 模式。
We introduce a proper display calculus for (non-distributive) Lattice Logic which is sound, complete, conservative, and enjoys cut-elimination and sub-formula property. Properness (i.e. closure under uniform substitution of all parametric parts in rules) is the main interest and added value of the present proposal, and allows for the smoothest Belnap-style proof of cut-elimination. Our proposal builds on an algebraic and order-theoretic analysis of the semantic environment of lattice logic, and applies the guidelines of the multi-type methodology in the design of display calculi.
We introduce a proper display calculus for first-order logic, of which we prove soundness, completeness, conservativity, subformula property and cut elimination via a Belnap-style metatheorem. All inference rules are closed under uniform substitution and are without side conditions.
A Cut-free, Sound and Complete Russellian Theory of Definite Descriptions
本文构建了一种带 λ 项与限定摹状词的一阶逻辑矢列演算，在保持罗素式立场的同时将摹状词视为真正项，并给出无切分、构造性切消与 Henkin 式完备性证明。
In this note we give a simplified ordinal analysis of first-order reflection. An ordinal notation system $OT$ is introduced based on $ψ$-functions. Provable $Σ_{1}$-sentences on $L_{ω_{1}^{CK}}$ are bounded through cut-elimination on operator controlled derivations.
Proof-theoretic aspects of paraconsistency with strong consistency operator
本文研究具有强一致性算子的 Ciore 及其一阶版本 QCiore，分别构造双侧矢列系统，并证明消切割、一阶完备性等证明论性质。
We analyse the philosopher Davidson's semantics of actions, using a strongly typed logic with contexts given by sets of partial equations between the outcomes of actions. This provides a perspicuous and elegant treatment of reasoning about action, analogous to Reiter's work on artificial intelligence. We define a sequent calculus for this logic, prove cut elimination, and give a semantics based on fibrations over partial cartesian categories: we give a structure theory for such fibrations. The existence of lax comma objects is necessary for the proof of cut elimination, and we give conditions …
扫码添加微信好友，提出您的宝贵建议 👇
💡 备注请填写：网站反馈
发表机构由 AI 从论文文本抽取，如发现错误，欢迎反馈修正建议。