Tractable Reasoning in Aritificial Intelligence

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Logic is one of the most popular approaches to artificial intelligence. A potential obstacle to the use of logic is its high computational complexity, as logical inference is an extraordinarily powerful computational device. This book is concerned with computational aspects of the logical approach to AI. The focus is on two strategies for achieving computational tractability in knowledge representation and reasoning by language restriction and approximation. Several formalisms for knowledge representation are taken into account, among the computational problems studied are checking satisfiability and entailment of formulae, finding a model, and approximating and compiling a logical for