day(saturday). ¬(warm(saturday)). trained(fred). ∀ X[spaniel(

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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The following propositions have been taken from the textbook (page 113). Apply the
data-driven strategy to find the location of fred, i.e., evaluate the goal location(fred,X). You need to
show the AND/OR graph.


collie(fred).
master(fred,sam).
day(saturday).
¬(warm(saturday)).
trained(fred).
∀ X[spaniel(X) ˅ (collie(X) ˄ trained(X)) → gooddog(X)]
∀ (X,Y,Z) [gooddog(X) ˄ master(X,Y) ˄ location(Y,Z) → location(X,Z)]
(day(saturday) ˄ warm(saturday)) → location(sam,park).
(day(saturday) ˄ ¬(warm(saturday))) → location(sam,museum).

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