## Principles of Artificial IntelligenceA classic introduction to artificial intelligence intended to bridge the gap between theory and practice, Principles of Artificial Intelligence describes fundamental AI ideas that underlie applications such as natural language processing, automatic programming, robotics, machine vision, automatic theorem proving, and intelligent data retrieval. Rather than focusing on the subject matter of the applications, the book is organized around general computational concepts involving the kinds of data structures used, the types of operations performed on the data structures, and the properties of the control strategies used. Principles of Artificial Intelligenceevolved from the author's courses and seminars at Stanford University and University of Massachusetts, Amherst, and is suitable for text use in a senior or graduate AI course, or for individual study. |

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Page 101

In graphs , we call a node having no successors a leaf node ( a tip node for trees ) . ... The task of the production system can be regarded as finding a

In graphs , we call a node having no successors a leaf node ( a tip node for trees ) . ... The task of the production system can be regarded as finding a

**solution graph**from the start node to the terminal nodes .Page 102

Let G ' denote a

Let G ' denote a

**solution graph**from node n to a set N of nodes of an AND / OR graph G. G ' is a subgraph of G. If n is an element of N , G ' consists of the single node n ; otherwise , if n has an outgoing connector , K , directed to ...Page 106

This revised cost estimate is propagated upward in the graph . ( Acyclicity of our graphs guarantees no loops in this upward propagation . ) The revised cost , q ( n ) , is an updated estimate of the cost of an optimal

This revised cost estimate is propagated upward in the graph . ( Acyclicity of our graphs guarantees no loops in this upward propagation . ) The revised cost , q ( n ) , is an updated estimate of the cost of an optimal

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### Contents

PROLOGUE | 1 |

PRODUCTION SYSTEMS AND AI | 17 |

SEARCH STRATEGIES FOR | 53 |

Copyright | |

9 other sections not shown

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### Common terms and phrases

achieve actions algorithm AND/OR graph answer applied arcs Artificial Intelligence assume attempt backtracking backward block called chapter clause CLEAR(C complete component condition consider consistent contains control strategy corresponding cost database deduction Deleters described direction discussed efficient evaluation example expression F-rule fact Figure formula function given goal goal node goal stack goal wff HANDEMPTY heuristic important initial involves JOHN knowledge labeled language literals logic match methods move namely node Note obtained occur ONTABLE(A operation path possible precondition predicate calculus problem procedure production system proof prove quantified reasoning refutation represent representation resolution result robot rule satisfied selected sequence shown in Figure simple solution graph solve specify statement step STRIPS structure subgoal substitutions successors Suppose symbols termination theorem unifying unit University variables