
Theory of Computation Theoretical Computer Science  Automata Theory, Computability Theory, and Computational Complexity Theory 
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September 3rd, 2008, 12:51 PM  #1 
Joined: Sep 2008 Posts: 1  Automata Theory
Hi, first of all, sorry about my english if it's not perfect. I need your help to know what kind of languages are the next ones (regular, contextfree,...) : L1= {(a+b)^n b^j a^k  j+k < n < 2(j+k); n, j, k >= 0 } L2={(a+b)^n b^j a^k  n odd, j+k is even; n, j, k >=0} L3={(a+b)^n b^j a^k  j<n<2j, j<k<2j, j<n+k<3j; n,j,k>=0} Thanks, Tomas. 
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November 13th, 2008, 12:17 PM  #2 
Joined: Nov 2008 Posts: 1  Automata Theory
hello ,could you help me to solve this problem ,? must prove that {b^2i a^3j c^k : i,j,k integers and i>=j >k } is not regular language thanks for your help... 
October 30th, 2009, 01:30 AM  #3 
Joined: Oct 2009 Posts: 13  Re: Automata Theory
it is an expression of advanced mathsmatics.


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