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CSL
2007
Springer
13 years 10 months ago
The Power of Counting Logics on Restricted Classes of Finite Structures
Abstract. Although Cai, F¨urer and Immerman have shown that fixedpoint logic with counting (IFP + C) does not express all polynomialtime properties of finite structures, there h...
Anuj Dawar, David Richerby
CSL
2007
Springer
13 years 10 months ago
Subexponential Time and Fixed-Parameter Tractability: Exploiting the Miniaturization Mapping
Recently it has been shown that the miniaturization mapping M faithfully translates subexponential parameterized complexity into (unbounded) parameterized complexity. We determine...
Yijia Chen, Jörg Flum
CSL
2007
Springer
13 years 10 months ago
Unbounded Proof-Length Speed-Up in Deduction Modulo
In 1973, Parikh proved a speed-up theorem conjectured by G¨odel 37 years before: there exist arithmetical formulæ that are provable in first order arithmetic, but whose shorter ...
Guillaume Burel
CSL
2007
Springer
13 years 10 months ago
Not Enough Points Is Enough
Models of the untyped λ-calculus may be defined either as applicative structures satisfying a bunch of first order axioms, known as “λ-models”, or as (structures arising fr...
Antonio Bucciarelli, Thomas Ehrhard, Giulio Manzon...
CSL
2007
Springer
13 years 10 months ago
Forest Expressions
We define regular expressions for unranked trees (actually, ordered sequences of unranked trees, called forests). These are compared to existing regular expressions for trees. On ...
Mikolaj Bojanczyk
CSL
2007
Springer
13 years 10 months ago
Qualitative Temporal and Spatial Reasoning Revisited
Abstract. Establishing local consistency is one of the main algorithmic techniques in temporal and spatial reasoning. In this area, one of the central questions for the various pro...
Manuel Bodirsky, Hubie Chen
CSL
2007
Springer
13 years 10 months ago
Proofs, Programs and Abstract Complexity
Programs and Abstract Complexity A. Beckmann University of Wales Swansea Swansea, UK Axiom systems are ubiquitous in mathematical logic, one famous and well studied example being ...
Arnold Beckmann
CSL
2007
Springer
13 years 10 months ago
On Acyclic Conjunctive Queries and Constant Delay Enumeration
Guillaume Bagan, Arnaud Durand, Etienne Grandjean