Developments in Language Theory: 14th International - download pdf or read online

By Andrzej Ehrenfeucht, Grzegorz Rozenberg (auth.), Yuan Gao, Hanlin Lu, Shinnosuke Seki, Sheng Yu (eds.)

ISBN-10: 3642144543

ISBN-13: 9783642144547

This booklet constitutes the lawsuits of the 14th foreign convention on advancements in Language concept, DLT 2010, held in London, Ontario, Canada, in August 2010. The 32 average papers provided have been rigorously reviewed and chosen from a variety of submissions. the amount additionally includes the papers or abstracts of 6 invited audio system, in addition to a 2-page summary for every of the 6 poster papers. the subjects addressed are formal languages, automata conception, computability, complexity, good judgment, petri nets and comparable components.

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Additional resources for Developments in Language Theory: 14th International Conference, DLT 2010, London, ON, Canada, August 17-20, 2010. Proceedings

Sample text

On the other hand, trading complementation for Kleene star makes the problem intractable again. Theorem 25. 1. INEQ({1}, {∪, ·, ∼}) ∈ P. 2. INEQ({1}, {∪, ·, ∗ }) is ≤log m -complete in NP. 3. NL ≤log m INEQ({1}, {∪, ·, ∩}) and INEQ({1}, {∪, ·, ∩}) ∈ LOGCFL. 4. INEQ({1}, {∪, ·}) ∈ NL. In [58] the problem has been raised to determine the computational complexity of INEQ({1}, {∪, ·, ∗ , 2 , ∼}), that is, all operations considered so far are allowed. In particular, the problem can be solved in time tow(k, n), for any fixed k.

Regular expressions with numerical occurrence indicators – Preliminary results. In: Symposium on Programming Languages and Software Tools, Department of Computer Science, pp. 163–173. University of Kuopio, Finland (2003) 42. : Representation of events in nerve nets and finite automata. In: Automata Studies, pp. 3–42. Princeton University Press, Princeton (1956) 43. : The complexity of restricted regular expressions and the synthesis problem for finite automata. J. Comput. System Sci. 23, 348–354 (1981) 44.

Obviously the set P2 = {2n | n ≥ 1} of powers of two is 2-recognizable because rep2 (P2 ) = 10∗ . But since P2 is not ultimately periodic, Cobham’s theorem implies that P2 cannot be 3-recognizable. To see that a given infinite ordered set X = {x0 < x1 < x2 < · · · } is k-recognizable for no base k ≥ 2 at all, we can use results like the following one where the behavior of the ratio (resp. difference) of any two consecutive elements in X is studied through the quantities RX := lim sup i→∞ xi+1 and DX := lim sup (xi+1 − xi ).

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Developments in Language Theory: 14th International Conference, DLT 2010, London, ON, Canada, August 17-20, 2010. Proceedings by Andrzej Ehrenfeucht, Grzegorz Rozenberg (auth.), Yuan Gao, Hanlin Lu, Shinnosuke Seki, Sheng Yu (eds.)


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