Automated Reasoning with Analytic Tableaux and Related by Maria Paola Bonacina, Moa Johansson (auth.), Kai Brünnler, PDF

By Maria Paola Bonacina, Moa Johansson (auth.), Kai Brünnler, George Metcalfe (eds.)

ISBN-10: 3642221181

ISBN-13: 9783642221187

ISBN-10: 364222119X

ISBN-13: 9783642221194

This booklet constitutes the refereed complaints of the twentieth foreign convention on computerized Reasoning with Analytic Tableaux and similar tools, TABLEAUX 2011, held in Bern, Switzerland, in July 2011.The sixteen revised learn papers offered including 2 approach descriptions have been conscientiously reviewed and chosen from 34 submissions. The papers hide many issues within the wide selection of purposes of tableaux and comparable equipment reminiscent of analytic tableaux for varied logics, comparable recommendations and ideas, comparable tools, new calculi and strategies for theorem proving in classical and non-classical logics, in addition to structures, instruments, implementations and purposes; all with a different specialize in and software program verifications, semantic applied sciences, and data engineering.

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Extra resources for Automated Reasoning with Analytic Tableaux and Related Methods: 20th International Conference, TABLEAUX 2011, Bern, Switzerland, July 4-8, 2011. Proceedings

Example text

We assume furthermore that for every a ∈ C≈ and for all terms u, v ∈ θ(a), τ (u ≈ v) is L -dominated. Before proceeding, we give a concrete example of a theory T for which θ(a) and τ can be defined (it will be used in forthcoming examples). Example 3. Assume that Sorts contains in particular the sort symbols nat, int and real with their usual meanings. We assume that the signature contains the usual functions + and 6 and built-in constant symbols 0, . . , k of sort nat. If a : s ∈ C≈ , we define θ(a) as the set containing all terms in 0, .

G. Γ (φ) = {φ}). By Definition 3, EΓ (φ) is recursively enumerable. By Theorem 2, φ is T -satisfiable iff a schema ψ such that ψ{n ← 0} is T -satisfiable is eventually obtained. Of course, as such, this algorithm is very inefficient and seldom terminates (when the schema at hand is unsatisfiable): its efficiency and termination essentially depend on the choice of the simplification function. The next definition states a condition on Γ ensuring that all the schemata in EΓ (φ) remain in a given class. Definition 4.

Furthermore, we assume that for all u, v ∈ θ(a), there exists an iteration-free n-elementary schema τ (u ≈ v) such that τ (u ≈ v) ≡T u ≈ v. The intuition is as follows. If u and v occur in θ(a), then the considered schema will possibly contain a conjunction of the form an+2 ≈ u∧an+2 ≈ v. 2, the symbol an+2 will have to be eliminated (since it is non-n-elementary) by applying an appropriate function Δ. But to this purpose, one necessarily has to ensure that the equation u ≈ v holds. The existence of the function τ guarantees that this property can be expressed as an n-elementary schema.

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Automated Reasoning with Analytic Tableaux and Related Methods: 20th International Conference, TABLEAUX 2011, Bern, Switzerland, July 4-8, 2011. Proceedings by Maria Paola Bonacina, Moa Johansson (auth.), Kai Brünnler, George Metcalfe (eds.)


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