By Ana L. C. Bazzan, Sofiane Labidi

This publication constitutes the refereed lawsuits of the seventeenth Brazilian Symposium on man made 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 prepared in topical sections on logics, making plans, and theoretical tools; seek, reasoning, and uncertainty; wisdom illustration and ontologies; normal language processing; computer studying, wisdom discovery, and information mining; evolutionary computing, synthetic existence, and hybrid platforms; robotics and compiler imaginative and prescient; and independent brokers and multi-agent structures.

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A valuation is then extended to literals and clauses in the following way: 1. 2. for any atom for any clause Valuations of literals are real numbers in [0,1], but valuations of clauses are non-negative real numbers that can exceed 1. A valuation is a model of if A valuation is a countermodel of if Therefore it is possible for a formula to have neither a model nor a countermodel. 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.

Symbolic Logic and Mechanical Theorem Proving. Academic Press, London, 1973. 4. Mukesh Dalal. Anytime families of tractable propositional reasoners. In International Symposium of Artificial Intelligence and Mathematics AI/MATH-96, pages 42–45, 1996. 5. Mukesh Dalal. Semantics of an anytime family of reasponers. In 12th European Conference on Artificial Intelligence, pages 360–364, 1996. 6. Marcelo Finger and Renata Wassermann. Expressivity and control in limited reasoning. In Frank van Harmelen, editor, 15th European Conference on Artificial Intelligence (ECAI02), pages 272–276, Lyon, France, 2002.

Throughout the paper, we use lowercase Latin letters to denote prepositional letters, denote formulas, denote clauses and denote a literal. Uppercase Greek letters denote sets of formulas. By we mean the set of all prepositional letters in the formula if is a set of formulas, Due to space limitations, some proofs of lemmas have been omitted. TEAM LinG Towards Polynomial Approximations of Full Propositional Logic 13 Dalal’s Polynomial Approximation Strategy 2 Dalal specifies a family of anytime reasoners based on an equivalence relation between formulas [4].