'Sentence connective sentence' diaporamas de présentation

CMSC 471 Fall 2011 Class #11 Thursday, October 6 Propositional and First-Order Logic

Professor Marie desJardins, mariedj@cs.umbc.edu. CMSC 471 Fall 2011 Class #11 Thursday, October 6 Propositional and First-Order Logic. Chapter 7.4-7.8. Propositional Logic. Some material adopted from notes by Andreas Geyer-Schulz and Chuck Dyer. Propositional Logic.

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Knowledge-Based Systems

Knowledge-Based Systems. Introduction to Logic. Overview Logic and Reasoning. Motivation Objectives Knowledge and Reasoning logic as prototypical reasoning system syntax and semantics validity and satisfiability logic languages Reasoning Methods propositional and predicate calculus

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CPE/CSC 481: Knowledge-Based Systems

CPE/CSC 481: Knowledge-Based Systems. Dr. Franz J. Kurfess Computer Science Department Cal Poly. Motivation Objectives Knowledge and Reasoning logic as prototypical reasoning system syntax and semantics validity and satisfiability logic languages Reasoning Methods

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Limitations of systems reviewed so far

Limitations of systems reviewed so far. Goal was fixed: analyze human activity; comment soccer game Vision was fixed and feedforward/bottom-up: no top-down control These systems cannot deal with unexpected/new questions about the scene. Towards the minimal subscene.

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CMSC 671 Fall 2010

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First Order Logic (Syntax, Semantics and Inference)

First Order Logic (Syntax, Semantics and Inference). Knowledge based agents can represent the world it is in and can deduce the actions to take In most programming languages the data and operations are tied closely

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Last time: Logic and Reasoning

Last time: Logic and Reasoning. Knowledge Base (KB): contains a set of sentences expressed using a knowledge representation language TELL: operator to add a sentence to the KB ASK: to query the KB Logics are KRLs where conclusions can be drawn Syntax Semantics

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CMSC 671 Fall 2001

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Knowledge Representation and Reasoning

Knowledge Representation and Reasoning. Knowledge Representation & Reasoning. How knowledge about the world can be represented What kinds of reasoning can be done with that knowledge. Two different systems that are commonly used to represent knowledge: Propositional calculus

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CMSC 471 Fall 2004

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CSC 463 Fall 2010

Class # 11. CSC 463 Fall 2010. Chapter 7.4-7.5, 7.7. Propositional Logic. Some material adopted from notes by Marie desJardins, Andreas Geyer-Schulz and Chuck Dyer. Propositional logic. Logical constants : true, false Propositional symbols : P, Q, S, ... ( atomic sentences )

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CMSC 471 Fall 2004

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Propositional Logic

CMSC 471. Propositional Logic. Chapter 7.4-7.5, 7.7. Adapted from slides by Tim Finin and Marie desJardins. Some material adopted from notes by Andreas Geyer-Schulz and Chuck Dyer. Propositional logic. Logical constants : true, false

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Basic Knowledge Representation in First Order Logic

Basic Knowledge Representation in First Order Logic. Some material adopted from notes by Tim Finin And Andreas Geyer-Schulz. First Order (Predicate) Logic (FOL). First-order logic is used to model the world in terms of objects which are things with individual identities

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Reasoning/Inference

Reasoning/Inference. Given a set of facts/beliefs/rules/evidence Evaluate a given statement Determine the truth of a statement Determine the probability of a statement Find a statement that satisfies a set of constraints SAT Find a statement that optimizes a set of constraints

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First-Order Logic

First-Order Logic. Chapter 8 Modified by Vali Derhami. Outline. Why FOL? Syntax and semantics of FOL Using FOL Wumpus world in FOL Knowledge engineering in FOL. propositional logic. Propositional logic is declarative ( (??????

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For Friday

For Friday. Read chapter 8 Homework: Chapter 7, exercises 2 and 10 Program 1, Milestone 2 due. Program 1. Any questions?. Propositional Inference Rules. Modus Ponens or Implication Elimination And-Elimination Unit Resolution Resolution. Simpler Inference. Horn clauses

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First Order Logic

First Order Logic. CSE 573 Introduction to Artificial Intelligence Henry Kautz Fall 2005. Resolution. DPLL and Walksat do inference by searching through space of truth assignments Alternative approach to reasoning: derive new sentences from old sentences, by well-defined rules

319 views • 17 slides