1. Consider the following Prolog facts and rules: member (X, (X|_]). member (X, [_T]) :- member (X, T). subset ((), _). subset([HT], S) :- member (H, S), subset (T, S). (a) (b) Draw the Prolog tree corresponding to the following query: ?- subset([a,b], [a,b,a]). true ; true ; false. There are 7 possible places to insert a single cut (!) in the set of axioms, marked below by [1]-[7]: member (X, (✗|_]) :- ![1]. member (X, [_[T]) :- ![2], member (X, T), ! [3]. subset ((), ) :- ! [4]. subset([HT], S) :- ![5], member(H, S), ! [6], subset (T, S), ! [7] . Which of these cuts are causing a unique solution as shown below? (You are using a single cut at a time.) ? subset1 ([a,b], [a,b,a]). true. Explain the role of each cut by showing what parts of the tree it removes.
1. Consider the following Prolog facts and rules: member (X, (X|_]). member (X, [_T]) :- member (X, T). subset ((), _). subset([HT], S) :- member (H, S), subset (T, S). (a) (b) Draw the Prolog tree corresponding to the following query: ?- subset([a,b], [a,b,a]). true ; true ; false. There are 7 possible places to insert a single cut (!) in the set of axioms, marked below by [1]-[7]: member (X, (✗|_]) :- ![1]. member (X, [_[T]) :- ![2], member (X, T), ! [3]. subset ((), ) :- ! [4]. subset([HT], S) :- ![5], member(H, S), ! [6], subset (T, S), ! [7] . Which of these cuts are causing a unique solution as shown below? (You are using a single cut at a time.) ? subset1 ([a,b], [a,b,a]). true. Explain the role of each cut by showing what parts of the tree it removes.
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
Related questions
Question
![1.
Consider the following Prolog facts and rules:
member (X, (X|_]).
member (X, [_T]) :- member (X, T).
subset ((), _).
subset([HT], S) :- member (H, S), subset (T, S).
(a)
(b)
Draw the Prolog tree corresponding to the following query:
?- subset([a,b], [a,b,a]).
true ;
true ;
false.
There are 7 possible places to insert a single cut (!) in the set of axioms, marked below
by [1]-[7]:
member (X, (✗|_]) :- ![1].
member (X, [_[T]) :- ![2], member (X, T), ! [3].
subset ((), ) :- ! [4].
subset([HT], S) :- ![5], member(H, S), ! [6], subset (T, S), ! [7] .
Which of these cuts are causing a unique solution as shown below? (You are using a single
cut at a time.)
? subset1 ([a,b], [a,b,a]).
true.
Explain the role of each cut by showing what parts of the tree it removes.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F3cf857cb-1da8-400e-ac43-d59da390b1f7%2Fb8c5b4c9-b280-491d-b3c4-b1ea2372af9a%2F2ku8in_processed.png&w=3840&q=75)
Transcribed Image Text:1.
Consider the following Prolog facts and rules:
member (X, (X|_]).
member (X, [_T]) :- member (X, T).
subset ((), _).
subset([HT], S) :- member (H, S), subset (T, S).
(a)
(b)
Draw the Prolog tree corresponding to the following query:
?- subset([a,b], [a,b,a]).
true ;
true ;
false.
There are 7 possible places to insert a single cut (!) in the set of axioms, marked below
by [1]-[7]:
member (X, (✗|_]) :- ![1].
member (X, [_[T]) :- ![2], member (X, T), ! [3].
subset ((), ) :- ! [4].
subset([HT], S) :- ![5], member(H, S), ! [6], subset (T, S), ! [7] .
Which of these cuts are causing a unique solution as shown below? (You are using a single
cut at a time.)
? subset1 ([a,b], [a,b,a]).
true.
Explain the role of each cut by showing what parts of the tree it removes.
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