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Home > Mathematics and Science Textbooks > Mathematics > Calculus and mathematical analysis > Relative Complexities of First Order Calculi: (Künstliche Intelligenz)
Relative Complexities of First Order Calculi: (Künstliche Intelligenz)

Relative Complexities of First Order Calculi: (Künstliche Intelligenz)


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About the Book

In this paper, a comparison is made of several proof calculi in terms of the lengths of shortest proofs for some given formula of first order predicate logic with function symbols. In particular, we address the question whether, given two calculi, any derivation in one of them can be simulated in the other in polynomial time. The analogous question for propositional logic has been intensively studied by various authors because of its implications for complexity theory. And it seems there has not been as much endeavour in this field in first order logic as there has been in propositional logic. On the other hand, fOr most of the practical applications of logic, a powerful tool such as the language of first order logic is needed. The main interest of this investigation lies in the calculi most frequently used in automated theorem proving, the resolution calculus, and analytic calculi such as the tableau calculus and the connection method. In automated theorem proving there are two important aspects of complexity. In order to have a good theorem proving system, we must first have some calculus in which we can express our derivations in concise form. And second, there must be an efficient search strategy. This book deals mainly with the first aspect which is a necessary condition for the second since the length of a shortest proof always also gives a lower bound to the complexity of any strategy.

Table of Contents:
1 Calculi for First Order Logic.- 1.1 Basic Concepts and General Remarks.- 1.2 Resolution.- 1.3 The Connection Method.- 1.4 Consolution.- 1.5 The Tableau Calculus TC.- 1.6 The Sequent Calculus.- 1.7 Natural Deduction.- 1.8 A Frege-Hilbert Calculus.- 2 Comparison of Calculi for First Order Logic.- 2.1 Known Results on the Complexity of Calculi.- 2.2 Transformation to Clausal Form.- 2.3 Complexity Measures for Resolution Refutations.- 2.4 Simulation of the Connection Calculus by Resolution.- 2.5 Non-Simulatability of Resolution in the Connection Calculus.- 2.6 Variants of the Tableau Calculus TC.- 2.7 The Method of Tableaux and the Connection Method.- 3 The Extension Rule in First Order Logic.- 3.1 The Extension Rule.- 3.2 Complexities of Formulas and Derivations.- 3.3 Occurrences in the Sequent Calculus.- 3.4 Application of Substitutions to Formulas.- 3.5 Transformation of Sequents to Clauses.- 3.6 Simulation of the Sequent Calculus in Extended Resolution.- 3.7 Gentzen’s Transformations.- 3.8 Definitions.- 4 Connection Structures.- 4.1 Unifier Sets.- 4.2 From Resolution to Connection Proofs.- 4.3 Connection Structures.- 4.4 The Connection Structure Calculus.- 4.5 Splitting with Connection Structures.- 4.6 Extended Definitional Calculi.- Conclusion.


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Product Details
  • ISBN-13: 9783528051228
  • Publisher: Friedrich Vieweg & Sohn Verlagsgesellschaft mbH
  • Publisher Imprint: Friedrich Vieweg & Sohn Verlagsgesellschaft mbH
  • Language: German
  • Returnable: Y
  • Series Title: Künstliche Intelligenz
  • ISBN-10: 3528051221
  • Publisher Date: 01 Jan 1992
  • Binding: Paperback
  • No of Pages: 173
  • Returnable: Y


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