0403-notes - CPSC 121 Lecture 34 April 3, 2009 Menu April...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: CPSC 121 Lecture 34 April 3, 2009 Menu April 3, 2009 Topics: Regular Expressions and DFAs (revisited) Reading: Today: Epp 12.1 Lab 8 prep Reminders: Assignment 4 due TODAY (by 17:00) Teaching evaluation survey now available on-line deadline 23:00 April 12 TA teaching evaluation in-class Monday, April 6 Assignment/quiz/midterm return in-class Monday, April 6 Review session (Steve): Thu April 9, 9:00, DMP 310 Review session (Bob): Thu April 16, 14:00, DMP 110 Final exam Friday, April 17, 7:00pm, SRC A READ the WebCT Vista course announcements board Language Defined by a Regular Expression Let be a given (finite) alphabet. The function L that associates a language to each regular expression, r , over is defined below. L ( r ) is called the language defined by r 1. Base cases: L ( ) = , L ( ) = { } , a , L ( a ) = { a } 2. Recursive cases: If L ( r ) and L ( s ) are languages defined by regular expressions r and s over , then L ( rs ) = L ( r ) L ( s ) L ( r | s ) = L ( r ) L ( s ) L ( r * ) = ( L ( r )) * Given a regular expression, r , one can determine the (formal) language defined by...
View Full Document

This note was uploaded on 01/09/2010 for the course CPSC 121 taught by Professor Belleville during the Spring '08 term at The University of British Columbia.

Page1 / 3

0403-notes - CPSC 121 Lecture 34 April 3, 2009 Menu April...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online