Categorize the following languages: a) B = {w| w has at least three a’s and at least two b’s}, assume Σ={a, b}. b) B = {ww | w ∈ {0, 1}*}. c) B = {wwR | w ∈ {0, 1}*}. d) B = {anbn | n ≥ 0}. e) B = {anbncn | n ≥ 0}. Which are regular languages? Which are context-free languages but non-regular languages? Which are non-context-free languages?
Categorize the following languages: a) B = {w| w has at least three a’s and at least two b’s}, assume Σ={a, b}. b) B = {ww | w ∈ {0, 1}*}. c) B = {wwR | w ∈ {0, 1}*}. d) B = {anbn | n ≥ 0}. e) B = {anbncn | n ≥ 0}. Which are regular languages? Which are context-free languages but non-regular languages? Which are non-context-free languages?
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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Categorize the following languages:
a) B = {w| w has at least three a’s and at least two b’s}, assume Σ={a, b}.
b) B = {ww | w ∈ {0, 1}*}.
c) B = {wwR | w ∈ {0, 1}*}.
d) B = {anbn | n ≥ 0}.
e) B = {anbncn | n ≥ 0}.
Which are regular languages?
Which are context-free languages but non-regular languages?
Which are non-context-free languages?
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