By Andrei Voronkov

ISBN-10: 3540439315

ISBN-13: 9783540439318

This ebook constitutes the refereed complaints of the 18th foreign convention on automatic Deduction, CADE - 18, held in Copenhagen, Denmark, in July 2002. The 27 revised complete papers and 10 approach descriptions awarded including 3 invited contributions have been rigorously reviewed and chosen from 70 submissions. The booklet bargains topical sections on description logics and the semantic net, proofcarrying code and compiler verifications, non-classical logics, method descriptions, SAT, version new release, CASC, mix and selection strategies, logical frameworks, version checking, equational reasoning, and facts conception.

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Additional info for Automated deduction-CADE-18: 18th International Conference on Automated Deduction, Copenhagen, Denmark, July 27-30, 2002 : proceedings

Sample text

In this paper, we will identify time with the CPU clock and regard propositions as statements about machine states. ” We can also specify security policies in temporal logic. For example, the proposition ✷(pc ≥ 0 ∧ pc < 100) asserts that “the program counter is always between zero and 100,” but we can also interpret this as the requirement “the program counter must always be between zero and 100”—a specification for a simple form of control-flow safety [7]. We will exploit this duality to reap a practical benefit.

The reason for this is that, by taking advantage of K’s layered model property, we can split various space-consuming BDDs into smaller ones—depending on the modal depth of the corresponding subformulas. This minimizes space-outs and improves run time. When compared with *SAT on the TANCS 98 benchmarks, all our approaches are still weaker than *SAT. Our implementation, however, is still open to a number of optimizations. In BDD-based symbolic model checking, it turned out that performance is extremely sensitive to the chosen order of BDD variables [7].

P @[t1 , t2 ) (“p is true over t1 to t2 ”) holds when p is true at all times in the half-open interval [t1 , t2 ). Thus, φ φ φ φ p @ t (“φ satisfies p at time t”) holds if p is true of φ at time t. φ R(e1 , . . , ek ) @ t iff Vφ (e1 )(V(t)), . . , Vφ (ek )(V(t)) ∈ J (R) p1 ∧ p2 @ t iff φ p1 @ t and φ p2 @ t iff φ[aτ →π τ ] [aτ /xτ ] p @ t for some aτ not appearing in p ∀xτ : ρ. p @ t and all π τ such that π τ : ρ p1 U p2 @ t iff φ p2 @ t2 for some t2 such that φ t2 ≥ t and φ p1 @[t, t2 ) φ p @[t1 , t2 ) iff φ p @ t for all t such that φ t ≥ t1 and φ t2 ≥ t + 1 Fig.

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Automated deduction-CADE-18: 18th International Conference on Automated Deduction, Copenhagen, Denmark, July 27-30, 2002 : proceedings by Andrei Voronkov


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