Exercise 4 For each of the grammars in Exercise 3 except the last, give an unam- biguous grammar for the same language. (The last grammar in that exercise is a classic example of an inherently ambiguous grammar-it cannot be fixed!) c. The following grammar for strings of balanced parentheses. (A language of any number of different kinds of balanced parentheses is called a Dyck lan- guage. This type of language plays an interesting role in the theory of formal languages.) ::= | ( ) | () You need to work on part(c) following the examples in part(a) and (b) to give an unambiguous grammar.

Exercise 4 For each of the grammars in Exercise 3 except the last, give an unam- biguous grammar for the same language. (The last grammar in that exercise is a classic example of an inherently ambiguous grammar-it cannot be fixed!) c. The following grammar for strings of balanced parentheses. (A language of any number of different kinds of balanced parentheses is called a Dyck lan- guage. This type of language plays an interesting role in the theory of formal languages.) ::= | ( ) | () You need to work on part(c) following the examples in part(a) and (b) to give an unambiguous grammar.

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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Machines that use artificial intelligence to learn from the environment and past experiences to perform better in the presence of variability and uncertainty are called intelligent machines. Intelligence develops according to environment and experience. It is human-like behavior. When the computer system or any programmed machine learns from the inputs and corresponding outputs, it can be called an intelligent machine.

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Exercise 4 For each of the grammars in Exercise 3 except the last, give an unam-
biguous grammar for the same language. (The last grammar in that exercise is a
classic example of an inherently ambiguous grammar-it cannot be fixed!)
c. The following grammar for strings of balanced parentheses. (A language of
any number of different kinds of balanced parentheses is called a Dyck lan-
guage. This type of language plays an interesting role in the theory of formal
languages.)
<S> <S> |
| ( <s> ) | ()
You need to work on part(c) following the examples in part(a) and (b) to give an unambiguous
grammar.

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Need help with part (c). Thank you :)
3. Feature grammars, semantics (a) Consider the following context-free grammar: S + NP VP VP → VNP NP → he she | him | her → likes V Augment this grammar to become a unification-based (feature-based) grammar, by adding a 'case' feature, and constraints to enforce case agreement, to restrict the language to only those sentences that are correct English. You can use the notation used in the lectures or the notation of NLTK.
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