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Non-Context-Free Languages

Non-Context-Free Languages. Lecture 10 Section 2.3 Fri, Oct 13, 2006. Non-Context-Free Languages. It turns out that not all languages are context-free. An example of a non-context-free language is { a n b n c n | n  0}. To process this would require two stacks. The Pumping Lemma.

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CSC 4630

CSC 4630. Meeting 21 April 4, 2007. Return to Perl. Where are we? What is confusing? What practice do you need?. Ray’s Problem. Given a string of the form: 1 b 2 b 3 b 4 b 5 b 6 b 7 b 8 b 9 = 100 replace the 8 b’s with one plus sign two minus signs

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Lecture # 2

Lecture # 2. An Important language. PALINDROME The language consisting of Λ and the strings s defined over Σ such that Rev(s)=s. It is to be denoted that the words of PALINDROME are called palindromes. Example : For Σ ={a,b}, PALINDROME={ Λ , a, b, aa, bb, aaa, aba, bab, bbb, ...}.

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