381hw4solns

# 381hw4solns - Solution for Problem 1 on Assignment 4 0 R11...

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Solution for Problem 1 on Assignment 4 0 11 0 12 0 13 0 21 0 22 0 23 0 31 0 32 0 33 0 1 1 0 0 1 R R R R R R R R R ε ε ε = = = = = + = = = ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) * 1 11 * 1 12 * 1 13 * 1 21 * 1 22 * 1 23 * 1 31 * 1 32 * 1 33 0 0 0 1 1 1 1 1 1 0 1 0 0 10 1 1 11 0 0 0 1 0 0 1 00 0 1 01 R R R R R R R R R ε ε ε ε ε ε ε ε ε ε ε ε ε ε ε ε ε ε ε ε ε = + = = + = = + = = + = = + + = + + =Φ+ = = + = = + = + = + = + ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( )( ) ( ) ( )( ) ( ) ( ) ( )( ) ( ) ( )( ) * * 2 11 * * 2 12 * * 2 13 * * 2 21 * * 2 22 * * 2 23 * 2 31 0 0 10 1 0 0 10 1 0 0 0 10 0 10 0 0 0 10 1 0 0 10 11 1 0 0 10 11 1 0 10 0 10 1 1 0 10 1 0 10 0 10 0 10 0 10 0 10 11 0 10 0 10 11 0 10 11 0 1 00 0 10 R R R R R R R ε ε ε ε ε ε ε ε ε ε ε ε ε ε ε = + + + = + + = + + + + + = + + = + + + = + + = + + + + + = + + = + + + + + + + + + = + = + + + + + = + = + + + + ( )( ) ( )( ) ( ) ( )( ) ( )( ) ( )( ) * * * 2 32 * * 2 33 1 0 1 00 0 10 1 1 00 1 00 0 10 0 10 1 00 0 10 01 1 00 0 10 11 01 1 00 0 10 11 R R ε ε ε ε ε = + + + = + + + + + + + = + + = + + + + + = + + + + The regular expression describing the strings accepted is ( ) ( ) ( )( ) ( )( ) ( ) * * * * * 3 13 1 0 0 10 11 1 0 0 10 11 01 1 00 0 10 11 01 1 00 0 10 11 R ε ε = + + + + + + + + + + + + +

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CS381, Homework #4 Solutions Question 2 Let L 1 = { 0 n 10 n +1 | n 1 } and let L 2 = { 0 n 10 2 n 1 | n 1 } . Express the set L consisting of strings of the form 0100100001000001... where the number of zeros in successive blocks increases as 1,2,4,5,10,11,22,23,... i.e., alternate adding one and multiplying by two. The number of blocks of zeros can be even or odd. A correct solution is: ( L 1 ) * (0 * 1 * ) 01( L 2 ) * (0 * 1 * ) Both sides need to be followed by (0 * 1 * ) in order to allow strings to have an even or odd number of zeros.
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• Fall '05
• HOPCROFT
• Regular expression, Regular language, New York City Subway, final state, Automata theory

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