Assume that R, S, and T are regular expressions and ε is the empty string and is the empty set. Select all the identities of that are correct: 0 ω * * = 0 = 0 Q * = ω ☐ ω * = ε (R*)* = R ☐ R. R+ = R * ε + R.R* = R * |(R.S)* .R = R. (R.S)* (R+S)* = (R*. S*)*

Assume that R, S, and T are regular expressions and ε is the empty string and is the empty set. Select all the identities of that are correct: 0 ω * * = 0 = 0 Q * = ω ☐ ω * = ε (R) = R ☐ R. R+ = R * ε + R.R* = R * |(R.S)* .R = R. (R.S)* (R+S)* = (R. S)*

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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Question

Refer to attached images and provide correct solutions!

Assume that R, S, and T are regular
expressions and ε is the empty
string and is the empty set.
Select all the identities of that are
correct:
ω
Q
0 = 0
ε
*
=
Q
*
= ε
*
= ε
*
(R*)* = R
*
☐ R. R+ = R*
ε + R.R* = R*
| (R.S)* .R = R. (R.S)*
(R+S)* = (R". S*')"

The regular expression for the set
{b, ba, baa, baaa, ...} is as R=ba*.
○ True
○ False

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