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* + ba + (ab)* 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)

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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Question

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.

Theory that deals with fundamental questions around what problems can and cannot be solved using computation and uses a model of computation to understand the degree to which computers can assist in solving problems. There are three main branches of this subject: automata theory and formal languages, computational complexity theory, and computability theory.

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