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New Developments in Formal Languages and Applications by Gemma Bel-Enguix, M Dolores Jiménez-López, Carlos

By Gemma Bel-Enguix, M Dolores Jiménez-López, Carlos Martin-Vide

The concept of formal languages is well known because the spine of theoretical machine technology, originating from arithmetic and generative linguistics, between others. As a foundational self-discipline, formal language conception techniques and methods are found in various theoretical and utilized fields of up to date study that are focused on image manipulation: discrete arithmetic, bioinformatics, traditional language processing, trend reputation, textual content retrieval, studying, cryptography, compression, etc.

This quantity offers the most result of a few fresh, speedy constructing subfields of formal language conception in an simply available method and offers the reader with huge bibliographical references to move deeper. Open difficulties are formulated too. The meant viewers comprises undergraduates and graduates in desktop technological know-how or arithmetic. Graduates in different disciplines (linguistics, electric engineering, molecular biology, good judgment) with a few uncomplicated point of mathematical adulthood may perhaps locate the amount attractive and priceless too. The publication represents "a gate to formal language concept and its purposes" and a resource of data in computation thought in general.

This quantity is complementary of the volumes within the Springer sequence reports in Fuzziness and tender Computing, quantity 148, and stories in Computational Intelligence, 25.

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3. m = 6, n1 = 1 and n2 = 3. Extensive experimentation suggests that these results (and their symmetric equivalents) give a complete characterization of when Xm|n1 ,n2 is unavoidable. Conjecture 1 [15] The set Xm|n1 ,n2 is unavoidable if and only if one of the following conditions (or symmetric equivalents) holds: 1. {a m a, b n1 b} is unavoidable, m = 2n1 + n2 + 2 or m = n2 − n1 − 1, and n1 + 1 divides n2 + 1. 2. m = n2 − n1 − 1 or m = 2n1 + n2 + 2, and the highest power of 2 dividing n1 + 1 is less than the highest power of 2 dividing m + 1.

2 Open Problems on Partial Words 39 Lemma 6. [13] Let x, y be partial words and let m, n be positive integers such that xm ↑ y n with gcd(m, n) = 1. Call |x|/n = |y|/m = p. If there exists an integer i such that 0 ≤ i < p and xi,p is not 1-periodic, then D(yi,p ) is empty. Lemma 7. [13] Let x be a partial word, let m, p be positive integers, and let i be an integer such that 0 ≤ i < p. Then the relation xm i,p = xi,p x(i−|x|) mod p,p . . x(i−(m−1)|x|) mod p,p holds. The “good pairs” theorem is stated as follows.

15] The set Xm|n1 ,n2 is unavoidable if Conditions 1 or Conditions 2 or Conditions 3 hold: 1. {a m a, b n1 b} is unavoidable, m = 2n1 + n2 + 2 or m = n2 − n1 − 1, and n1 + 1 divides n2 + 1. 2. n1 < n2 , 2m = n1 + n2 and m − n1 divides m + 1. 3. m = 6, n1 = 1 and n2 = 3. Extensive experimentation suggests that these results (and their symmetric equivalents) give a complete characterization of when Xm|n1 ,n2 is unavoidable. Conjecture 1 [15] The set Xm|n1 ,n2 is unavoidable if and only if one of the following conditions (or symmetric equivalents) holds: 1.

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