One might suppose that we can avoid the problem of variable conflict in unification during backward chaining by standardizing apart all of the sentences in the knowledge base once and for all. Show that, for some sentences, this approach cannot work.
Answer to relevant QuestionsExplain how to write any given 3-SAT problem of arbitrary size using a single first-order definite clause and no more than 30 ground facts.The following Prolog code defines a predicate P: P(X, [X | Y]). P (X, [Y| Z]):- P (X, Z).a. Show proof trees and solutions for the queries P (A, [1, 2, 3]) and P (2, [1, A, 3])b. What standard list operation does P represent?Resolution can produce non-constructive proofs for queries with variables, so we had to introduce special mechanisms to extract definite answers. Explain why this issue does not arise with knowledge bases containing only ...Write a set of sentences that allows one to calculate the price of an individual tomato (or other object), given the price per pound. Extend the theory to allow the price of a bag of tomatoes to be calculated.A complete solution to the problem of inexact matches to the buyer’s description in shopping is very difficult and requires a full array of natural language processing and information retrieval techniques. (See Chapters 22 ...
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