Answered: THEOREM 2.20 A language is context free…

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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Can you help me create a state diagram for question 2.11 because I am really struggling with the problem Can you please show something visual like circles for the state diagram because I am a visual learner.

I need help with question 2.11 but to answer question 2.11 you need the question for 2.1. Again I only need help with question 2.11. the 2.1 question is in the photo. I added theorm 2.20 as well because the question asked for it. but I need help with question 2.11 and it has to be a pushdown automaton.

question for 2.11

2.11 Convert the CFG G4 given in Exercise 2.1 to an equivalent PDA, using the procedure given in Theorem 2.20.

2.1 Recall the CFG G4 that we gave in Example 2.4. For convenience, let's rename its
variables with single letters as follows,
EE+T|T
TTx F F
F(E) a
Give parse trees and derivations for each string,
a. a
b. ata
C. a+a+a
d. ((a))

THEOREM
2.20
Da Banen 400 000 R 4 000 00000000040AE
A language is context free if and only if some pushdown automaton recognizes it.
As usual for "if and only if" theorems, we have two directions to prove. In
this theorem, both directions are interesting. First, we do the easier forward
direction.

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