By G.L. Pozzato

ISBN-10: 1607500949

ISBN-13: 9781607500940

This quantity incorporates a revised and up-to-date model of the authors Ph.D. dissertation and is concentrated on facts tools and theorem proving for conditional and preferential logics. Conditional logics are extensions of classical good judgment by way of a conditional operator, frequently denoted as =>. Conditional logics have an extended historical past and lately they've got chanced on software in different parts of AI, together with trust revision and replace, the illustration of causal inferences in motion making plans and the formalization of hypothetical queries in deductive databases. Conditional logics have additionally been utilized with the intention to formalize nonmonotonic reasoning. The research of the kin among conditional logics and nonmonotonic reasoning has resulted in the seminal paintings via Kraus, Lehmann and Magidor, who've brought the so-called KLM framework. in response to this framework, a defeasible wisdom base is represented via a finite set of conditional assertions of the shape A |~ B, whose intuitive analyzing is ""typically (normally), the A's are B's"". The operator |~ is nonmonotonic within the feel |~ B doesn't suggest A and C |~ B. The logics of the KLM framework, sometimes called preferential logics, let to deduce new conditional statement from a given wisdom base. despite their value, only a few deductive mechanisms were built for conditional and preferential logics. during this publication, the writer attempts to (partially) fill the prevailing hole by way of introducing evidence equipment (sequent and tableau calculi) for conditional and preferential logics, in addition to theorem provers acquired via enforcing the proposed calculi. IOS Press is a global technological know-how, technical and scientific writer of high quality books for lecturers, scientists, and execs in all fields. the various parts we post in: -Biomedicine -Oncology -Artificial intelligence -Databases and knowledge structures -Maritime engineering -Nanotechnology -Geoengineering -All elements of physics -E-governance -E-commerce -The wisdom economic climate -Urban reports -Arms regulate -Understanding and responding to terrorism -Medical informatics -Computer Sciences

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Additional info for Conditional and Preferential Logics: Proof Methods and Theorem Proving

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8.

We define the complexity of a labelled formula F as follows: 1. cp (x : A) = 2 ∗ | A | Chapter 4: A Sequent Calculus for Standard Conditional Logics 50 A 2. cp (x −→ y) = 2 ∗ | A | +1 where | A | is the number of symbols occurring in the string representing the formula A. 8.

4. Irreflexivity, transitivity and modularity of < obviously follow from the definition of < . The smoothness condition is ensured by the fact that < does not have infinite descending chains, since < does not have. 5. For all xi ∈ W , for all propositional formulas A, M, xi |= A iff M , xi |= A. 5. By induction on the complexity of A. The proof is easy and left to the reader. 6. t. A is the antecedent of some conditional occurring in Γ, we have that xi ∈ M in< (A) iff xi ∈ M in< (A). 6. First, we prove that if xi ∈ M in< (A), then xi ∈ M in< (A).

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