Artificial Intelligence: A Modern Approach
3rd Edition
ISBN: 9780136042594
Author: Stuart Russell, Peter Norvig
Publisher: Prentice Hall
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Chapter 7, Problem 2E
(Adapted from Barwise and Etchemendy (1993).) Given the following, can you prove that the unicorn is mythical? How about magical? Horned?
If the unicorn is mythical, then it is immortal, but if it is not mythical, then it is a mortal mammal. If the unicorn is either immortal or a mammal, then it is horned. The unicorn is magical if it is horned.
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Students have asked these similar questions
1. Given the following, can you prove the unicorn is mythical? How about Magi-
cal? and Horned? (adapted from Barwise and Etchemendy (1993)).
if the unicorn is mythical, then it is immortal, but if it is not mythical,
then it is a mortal mammal. If the unicorn is either immortal or a
mammal, then it is horned. The unicorn is magical if it is horned.
2. Which of the following are correct?
(a) False E True
(b) (A A B) E (A + B)
(c) A + BEAVB
(d) A + BE¬AV B
(e) (A V B) ^ (¬A V B) is satisfiable
Can you give just one example, different from the one you have answered which works with all the sub-questions a, b, and c?
For (∃ x)(P(x,b))
Would an example of this being true if the domain was all the Avengers and x was green skin, then "b" being the Hulk would make this true.
Am example of this being false would be:
If the domain was all integers and x was positive, even integers and "b" was integers greater than zero.
Chapter 7 Solutions
Artificial Intelligence: A Modern Approach
Ch. 7 - Suppose the agent has progressed to the point...Ch. 7 - (Adapted from Barwise and Etchemendy (1993).)...Ch. 7 - Prob. 3ECh. 7 - Which of the following are correct? a. False |=...Ch. 7 - Prob. 5ECh. 7 - Prob. 6ECh. 7 - Prob. 7ECh. 7 - We have defined four binary logical connectives....Ch. 7 - Prob. 9ECh. 7 - Prob. 10E
Ch. 7 - Prob. 11ECh. 7 - Prob. 12ECh. 7 - Prob. 13ECh. 7 - Prob. 14ECh. 7 - Prob. 15ECh. 7 - Prob. 16ECh. 7 - Prob. 17ECh. 7 - Prob. 18ECh. 7 - A sentence is in disjunctive normal form (DNF) if...Ch. 7 - Prob. 20ECh. 7 - Prob. 21ECh. 7 - Prob. 23ECh. 7 - Prob. 24ECh. 7 - Prob. 25ECh. 7 - Prob. 26ECh. 7 - Prob. 27E
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