Download Computer Aided Verification: 15th International Conference, by Simon N. Foley (auth.), Warren A. Hunt Jr., Fabio Somenzi PDF

By Simon N. Foley (auth.), Warren A. Hunt Jr., Fabio Somenzi (eds.)

This e-book constitutes the refereed lawsuits of the fifteenth overseas convention on computing device Aided Verification, CAV 2003, held in Boulder, CO, united states in July 2003.

The 32 revised complete papers and nine software papers offered have been rigorously reviewed and chosen from a complete of 102 submissions. The papers are equipped in topical sections on bounded version checking; symbolic version checking; video games, bushes, and counters; instruments; abstraction; dense time; limitless kingdom platforms; purposes; theorem proving; automata-based verification; invariants; and particular version checking.

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Extra info for Computer Aided Verification: 15th International Conference, CAV 2003, Boulder, CO, USA, July 8-12, 2003. Proceedings

Sample text

Assuming there is at least one transition from every state in M , there is an infinite extension π of πk that is a computation path of M . Then π is a witness for ψ. Conversely, if there is no path of length k satisfying ψ in the bounded semantics without a loop, then every path of length k weakly satisfies ϕ. As noted in [5], the bounded semantics without a loop break the duality between strong and weak operators. The truncated semantics provide the missing dual weak semantics, and therefore render unnecessary the restriction of [5] to positive normal form.

The experimental results in Table 1 are obtained on a 2GHz Pentium-IV with 1Gb of memory. The second column in Table 1 lists the minimal k for which k-induction succeeds, the third column includes the total time (in seconds) needed for all inductions from 0 to k, and the fourth column the number of strengthenings. Timings do not include the one for quantifier elimination, since we restricted ourselves to syntactic quantifier elimination only. Notice that invariant strengthening is essential for the proofs of the Bakery protocol and Simpson’s protocol, since k-induction alone does not succeed for any k.

A truncated path is a path that is finite, but not necessarily maximal. Truncated paths arise naturally in several areas, among which are incomplete verification methods (such as simulation or bounded model checking) and hardware resets. We present a formalism for reasoning about truncated paths, and analyze its characteristics. 1 Introduction Traditional ltl semantics over finite paths [15] are defined for maximal paths in the model. That is, if we evaluate a formula over a finite path under traditional ltl finite semantics, it is because the last state of the path has no successor in the model.

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