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    STUDIA INFORMATICA - Issue no. 2 / 2005  

  Abstract:  Default logics represent a simple but a powerful class of non- monotonic formalisms. The main computational problem specific to these logical systems is a search problem: finding all the extensions (sets of non- monotonic theorems - beliefs) of a default theory. GADEL is an automated system based on a heuristic approach of the classical default extension com- puting problem and applies the principles of genetic algorithms to solve the problem. The purpose of this paper is to extend this heuristic approach for computing all type of default extensions: classical, justified, constrained and rational.  
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