5,168 research outputs found
Axiomatizations for Propositional and Modal Team Logic
A framework is developed that extends Hilbert-style proof systems for propositional and modal logics to comprehend their team-based counterparts. The method is applied to classical propositional logic and the modal logic K. Complete axiomatizations for their team-based extensions, propositional team logic PTL and modal team logic MTL, are presented
Axiomatizations for propositional and modal team logic
A framework is developed that extends Hilbert-style proof systems for propositional and modal logics to comprehend their team-based counterparts. The method is applied to classical propositional logic and the modal logic K. Complete axiomatizations for their team-based extensions, propositional team logic PTL and modal team logic MTL, are presented
On quantified propositional logics and the exponential time hierarchy
We study quantified propositional logics from the complexity theoretic point of view. First we introduce alternating dependency quantified boolean formulae (ADQBF) which generalize both quantified and dependency quantified boolean formulae. We show that the truth evaluation for ADQBF is AEXPTIME(poly)-complete. We also identify fragments for which the problem is complete for the levels of the exponential hierarchy. Second we study propositional team-based logics. We show that DQBF formulae correspond naturally to quantified propositional dependence logic and present a general NEXPTIME upper bound for quantified propositional logic with a large class of generalized dependence atoms. Moreover we show AEXPTIME(poly)-completeness for extensions of propositional team logic with generalized dependence atoms.University of AucklandAcademy of Finlan
Propositional union closed team logics
In this paper, we study several propositional team logics that are closed under unions, including propositional inclusion logic. We show that all these logics are expressively complete, and we introduce sound and complete systems of natural deduction for these logics. We also discuss the locality property and its connection with interpolation in these logics. (c) 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).Peer reviewe
The propositional logic of teams
Since the introduction by Hodges, and refinement by V\"a\"an\"anen, team
semantic constructions have been used to generate expressively enriched logics
still conserving nice properties, such as compactness or decidability. In
contrast, these logics fail to be substitutional, limiting any algebraic
treatment, and rendering schematic uniform proof systems impossible. This
shortcoming can be attributed to the flatness principle, commonly adhered to
when generating team semantics. Investigating the formation of team semantics
from algebraic semantics, and disregarding the flatness principle, we present
the logic of teams, LT, a substitutional logic for which important
propositional team logics are axiomatisable as fragments. Starting from
classical propositional logic and Boolean algebras, we give semantics for LT by
considering the algebras that are powersets of Boolean algebras B, equipped
with internal (point-wise) and external (set-theoretic) connectives.
Furthermore, we present a well-motivated complete and sound labelled natural
deduction system for LT.Comment: 28 page
Complexity of Propositional Logics in Team Semantic
We classify the computational complexity of the satisfiability, validity, and model-checking problems for propositional independence, inclusion, and team logic. Our main result shows that the satisfiability and validity problems for propositional team logic are complete for alternating exponential-time with polynomially many alternations.Peer reviewe
Structural completeness in propositional logics of dependence
In this paper we prove that three of the main propositional logics of
dependence (including propositional dependence logic and inquisitive logic),
none of which is structural, are structurally complete with respect to a class
of substitutions under which the logics are closed. We obtain an analogues
result with respect to stable substitutions, for the negative variants of some
well-known intermediate logics, which are intermediate theories that are
closely related to inquisitive logic
Uniform Definability in Propositional Dependence Logic
Both propositional dependence logic and inquisitive logic are expressively
complete. As a consequence, every formula with intuitionistic disjunction or
intuitionistic implication can be translated equivalently into a formula in the
language of propositional dependence logic without these two connectives. We
show that although such a (non-compositional) translation exists, neither
intuitionistic disjunction nor intuitionistic implication is uniformly
definable in propositional dependence logic
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