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On the Union Closed Fragment of Existential Second-Order Logic and Logics with Team Semantics [PDF]

open access: yesLogical Methods in Computer Science, 2021
We present syntactic characterisations for the union closed fragments of existential second-order logic and of logics with team semantics. Since union closure is a semantical and undecidable property, the normal form we introduce enables the handling and
Matthias Hoelzel, Richard Wilke
doaj   +5 more sources

The succinctness of first-order logic on linear orders [PDF]

open access: yesLogical Methods in Computer Science, 2005
Succinctness is a natural measure for comparing the strength of different logics. Intuitively, a logic L_1 is more succinct than another logic L_2 if all properties that can be expressed in L_2 can be expressed in L_1 by formulas of (approximately) the ...
Martin Grohe, Nicole Schweikardt
doaj   +6 more sources

Multiplicative-Additive Proof Equivalence is Logspace-complete, via Binary Decision Trees [PDF]

open access: yesLogical Methods in Computer Science, 2017
Given a logic presented in a sequent calculus, a natural question is that of equivalence of proofs: to determine whether two given proofs are equated by any denotational semantics, ie any categorical interpretation of the logic compatible with its cut ...
Marc Bagnol
doaj   +3 more sources

Propositional Logics Complexity and the Sub-Formula Property [PDF]

open access: yesElectronic Proceedings in Theoretical Computer Science, 2015
In 1979 Richard Statman proved, using proof-theory, that the purely implicational fragment of Intuitionistic Logic (M-imply) is PSPACE-complete.
Edward Hermann Haeusler
doaj   +5 more sources

Monadic Fragments of Intuitionistic Control Logic [PDF]

open access: yesBulletin of the Section of Logic, 2016
We investigate monadic fragments of Intuitionistic Control Logic (ICL), which is obtained from Intuitionistic Propositional Logic (IPL) by extending language of IPL by a constant distinct from intuitionistic constants. In particular we present the complete description of purely negational fragment and show that most of monadic fragments are finite.
Glenszczyk, Anna
openaire   +9 more sources

The Complexity of Reasoning for Fragments of Default Logic [PDF]

open access: greenJournal of Logic and Computation, 2008
Corrected ...
Olaf Beyersdorff   +3 more
openalex   +8 more sources

Alternating Quantifiers in Uniform One-Dimensional Fragments with an Excursion into Three-Variable Logic [PDF]

open access: diamondLogical Methods in Computer Science
The uniform one-dimensional fragment of first-order logic was introduced a few years ago as a generalization of the two-variable fragment to contexts involving relations of arity greater than two.
Oskar Fiuk, Emanuel Kieronski
doaj   +2 more sources

The Triguarded Fragment of First-Order Logic

open access: bronzeEPiC Series in Computing, 2018
Past research into decidable fragments of first-order logic (FO) has produced two very prominent fragments: the guarded fragment GF, and the two-variable fragment FO2. These fragments are of crucial importance because they provide significant insights into decidabil- ity and expressiveness of other (computational) logics like Modal Logics (MLs) and ...
Sebastian Rudolph, Mantas Šimkus
openalex   +3 more sources

Formal systems of fuzzy logic and their fragments

open access: bronzeAnnals of Pure and Applied Logic, 2007
Abstract Formal systems of fuzzy logic (including the well-known Łukasiewicz and Godel–Dummett infinite-valued logics) are well-established logical systems and respected members of the broad family of the so-called substructural logics closely related to the famous logic BCK. The study of fragments of logical systems is an important issue of research
Petr Cintula   +2 more
openalex   +4 more sources

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