New PDF release: A second course in formal languages and automata theory

By Jeffrey Shallit

ISBN-10: 0511438354

ISBN-13: 9780511438356

ISBN-10: 0521865727

ISBN-13: 9780521865722

Meant for graduate scholars and complicated undergraduates in laptop technology, A moment path in Formal Languages and Automata conception treats issues within the idea of computation now not often lined in a primary direction. After a overview of simple recommendations, the e-book covers combinatorics on phrases, usual languages, context-free languages, parsing and popularity, Turing machines, and different language periods. Many subject matters usually absent from different textbooks, comparable to repetitions in phrases, country complexity, the interchange lemma, 2DPDAs, and the incompressibility strategy, are lined the following. the writer areas specific emphasis at the assets had to symbolize sure languages. The ebook additionally contains a diversified choice of greater than 2 hundred workouts, feedback for time period initiatives, and study difficulties that stay open.

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Additional info for A second course in formal languages and automata theory

Example text

Let x, y, z be strings. In the Lyndon–Sch¨ utzenberger theorems, we proved a necessary and sufficient condition for xy = yx and xy = yz. Find similar necessary and sufficient conditions for (a) xy = y R x; (b) xy = y R z. 8 Projects 1. Investigate ω-languages, that is, those languages that consist of infinite words. Ordinary finite automata accept an ω-word if, according to one criterion, the path labeled by the word passes through an accepting state infinitely often. Start with the survey by Thomas [1991] and the book of Perrin and Pin [2003].

Similarly, a cube is a string of the form xxx, such as the English sort-of-word shshsh. If w contains no nonempty cube, it is said to be cubefree. The string cubefree is not squarefree, since it contains two consecutive occurrences of the string e, but it is cubefree. An overlap is a string of the form cxcxc, where x is a string and c is a single letter. ) The English string alfalfa, for example, is an overlap with c = a and x = lf. If w contains no overlap, it is said to be overlap-free. In this section, we prove some simple results in the theory of repetitions in strings.

3. 6 and how the Thue–Morse word 0110100110010110 · · · played a role in its solution. Start with the book of Adian [1979] and the survey paper of Gupta [1989]. 9 Research problems 1. An abelian square is a word of the form xx , |x| = |x | > 0, with x a permutation of x. An example in English is reappear. Similarly, an abelian cube is a word of the form xx x , |x| = |x | = |x | > 0, with x and x both permutations of x. An example in English is deeded. (a) Does there exist an infinite word over a three-letter alphabet avoiding abelian squares xx with |x| = |x | ≥ 2?

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A second course in formal languages and automata theory by Jeffrey Shallit


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