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23. Consider the two regular expressions, L1 = a* + b* L2 = ab* + ba* + b*a + (a*b)* a) Find a string corresponding to L1 but not to L2. b) Find a string corresponding to L2 but not to L1. c) Find a string corresponding to both L1 and L2. d) Find a string in {a, b}* corresponding to neither L1 nor L2.

23. Consider the two regular expressions, L1 = a* + b* L2 = ab* + ba* + b*a + (a*b)* a) Find a string corresponding to L1 but not to L2. b) Find a string corresponding to L2 but not to L1. c) Find a string corresponding to both L1 and L2. d) Find a string in {a, b}* corresponding to neither L1 nor L2.

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Subject: theory of computer science
23. Consider the two regular expressions, L1 = a* + b* L2 = ab* + ba* + b*a + (a*b)* a) Find a string corresponding to L1 but not to L2. b) Find a string corresponding to L2 but not to L1. c) Find a string corresponding to both L1 and L2. d) Find a string in {a, b}* corresponding to neither L1 nor L2.
Transcribed Image Text:23. Consider the two regular expressions, L1 = a* + b* L2 = ab* + ba* + b*a + (a*b)* a) Find a string corresponding to L1 but not to L2. b) Find a string corresponding to L2 but not to L1. c) Find a string corresponding to both L1 and L2. d) Find a string in {a, b}* corresponding to neither L1 nor L2.
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