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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
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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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*')"
Transcribed Image Text: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
Transcribed Image Text:The regular expression for the set {b, ba, baa, baaa, ...} is as R=ba*. ○ True ○ False
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