3. Are the following languages A and B over the alphabet = {a, b, c, d} regular or nonreg- ular? For a language that is regular, give a regular expression that defines it. • For a nonregular language, using the pumping lemma prove that it is not regular. (a) (b) A = {a³fk+2+1 |j≥ 1, k≥ 1, m > 1}U {b'cs+2+¹ \r>t≥ 1, s≥ 1}. B = {a³+³f²k+2m|j≥ 1, k ≥ 1, m≥ 1}U {br+3c³d²t-¹|r≥ 1, s ≥ 1, t ≥ 1} Hints: The languages A and B are each expressed as a union of two sets. If one (or both) of the sets is non-regular, this does not imply anything about the non-regularity of the union. When trying to show that a language C is non-regular, we have to apply the pumping lemma to the entire language C (and not to the components of the union). On the other hand, if trying to show that C is regular, you can give regular expressions for the two component sets and then apply "+".

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
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3. Are the following languages A and B over the alphabet Σ = {a, b, c, d} regular or nonreg-
ular?
• For a language that is regular, give a regular expression that defines it.
For a nonregular language, using the pumping lemma prove that it is not regular.
(a)
(b)
A
B
=
=
{ab+2cm+¹ | j≥ 1, k ≥ 1, m ≥ 1} U
{ b²c³+²dt+¹ | r≥ t≥ 1, s ≥ 1}.
{aj +³f²k+2cm | j≥ 1, k ≥ 1, m ≥ 1} U
{br+³c³d²t-¹ | r≥ 1, s ≥ 1, t≥ 1}
Hints: The languages A and B are each expressed as a union of two sets. If one (or
both) of the sets is non-regular, this does not imply anything about the non-regularity of
the union. When trying to show that a language C is non-regular, we have to apply the
pumping lemma to the entire language C (and not to the components of the union).
On the other hand, if trying to show that C is regular, you can give regular expressions
for the two component sets and then apply "+".
Transcribed Image Text:3. Are the following languages A and B over the alphabet Σ = {a, b, c, d} regular or nonreg- ular? • For a language that is regular, give a regular expression that defines it. For a nonregular language, using the pumping lemma prove that it is not regular. (a) (b) A B = = {ab+2cm+¹ | j≥ 1, k ≥ 1, m ≥ 1} U { b²c³+²dt+¹ | r≥ t≥ 1, s ≥ 1}. {aj +³f²k+2cm | j≥ 1, k ≥ 1, m ≥ 1} U {br+³c³d²t-¹ | r≥ 1, s ≥ 1, t≥ 1} Hints: The languages A and B are each expressed as a union of two sets. If one (or both) of the sets is non-regular, this does not imply anything about the non-regularity of the union. When trying to show that a language C is non-regular, we have to apply the pumping lemma to the entire language C (and not to the components of the union). On the other hand, if trying to show that C is regular, you can give regular expressions for the two component sets and then apply "+".
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