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1. If doable, find a regular expression for the following languages over alphabet {a, b}. i. Strings with an odd number of a ii. Both the number of a's and the number of b's are even iii. No string contains the substring aa iv. {a2n|ne N} U {b2n+1 | n € N} while N= {0,1,2,3,...}

1. If doable, find a regular expression for the following languages over alphabet {a, b}. i. Strings with an odd number of a ii. Both the number of a's and the number of b's are even iii. No string contains the substring aa iv. {a2n|ne N} U {b2n+1 | n € N} while N= {0,1,2,3,...}

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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1. If doable, find a regular expression for the following languages over alphabet {a, b}. i. Strings with an odd number of a ii. Both the number of a's and the number of b's are even iii. No string contains the substring aa iv. {a2n|ne N} U {b2n+1 | n € N} while N= {0,1,2,3,...}
Transcribed Image Text:1. If doable, find a regular expression for the following languages over alphabet {a, b}. i. Strings with an odd number of a ii. Both the number of a's and the number of b's are even iii. No string contains the substring aa iv. {a2n|ne N} U {b2n+1 | n € N} while N= {0,1,2,3,...}
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