Answered: S-> ABA | C A -> S | a| В -> bB С -> СА

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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kindly provide clear (step-by-step) explanations to help me understand the topic.

please strictly follow the given sequence (1-2-3) in cleaning the CFGs:
remove:
1 - unnecessary ε-productions
2 - useless symbols
3 - unit productions
in the given grammar.

(2)
а) S-> АBA | С
A -> S | a|ɛ
B -> bB | b
С -> СА
c) S-> BC | DaD | b
A-> aD | bA | c
В -> Cb
С -> аВ
D -> bS | ɛ
b) S-> BC
A -> a | b
d) S-> A | B
А-> аА | аС
В -> bВ | bС
В -> &
C-> DE | E
D-> BAB
C-> cdfF
D-> g|8
E-> h|ɛ
E -> с
F-> DE

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