By Ana L. C. Bazzan, Sofiane Labidi

This booklet constitutes the refereed lawsuits of the seventeenth Brazilian Symposium on synthetic Intelligence, SBIA 2004, held in Sao Luis, Maranhao, Brazil in September/October 2004.The fifty four revised complete papers offered have been conscientiously reviewed and chosen from 208 submissions from 21 nations. The papers are geared up in topical sections on logics, making plans, and theoretical equipment; seek, reasoning, and uncertainty; wisdom illustration and ontologies; typical language processing; laptop studying, wisdom discovery and information mining; evolutionary computing, man made lifestyles, and hybrid platforms; robotics and compiler imaginative and prescient; and self sustaining brokers and multi-agent platforms.

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**Extra resources for Advances in Artificial Intelligence - SBIA 2004: 17th Brazilian Symposium on Artificial Intelligence**

**Example text**

We say that is minimal if the following is optimal if the following condition holds The minimality condition is in practise unapproachable with the axiomatic system and the optimality condition take us to an NP-hard problem. We are interested in an intermediate point between minimality and optimality. To this end we characterize the minimality using the following definition. Definition 5. We define Union to be a rewriting rule which is applied to condense FDs with the same left-hand side. That is, if is finite, Union systematically makes the following transformation: Therefore, when we say that a set is minimal, we mean that this set is a minimal element of its equivalence class.

All of these logics are cast in the same mold. In fact, they are strongly based on Armstrong’s Axioms [6], a set of expressions which illustrates the semantics of FDs. These FD logics cited above were created to formally specify FDs and as a metatheoretical tool to prove FD properties. Unfortunately, all of these FD axiomatic systems have a common heart: the transitivity rule. The strong dependence with respect to the transitivity inference rule avoids its executable implementation into RL. The most famous problem concerning FDs is the Implication Problem: we have a set of FDs and we would like to prove if a given FD can be deduced from using the axiomatic system.

For instance, if then has neither a model nor a countermodel. A valuation is a model of a theory (set of clauses) if it is a model of all clauses in it. Define iff no model of the theory is a countermodel of Proposition 1 ([5]). For every theory and every clause iff So is sound and complete with respect to The next step is to generalize this approach to obtain a semantics of For that, for any a set V of valuations is a iff for each clause of size at most if V has a non-model of then V has a countermodel of V is a of if each is a model of this notion extends to theories as usual.