Titlebook: Results and Trends in Theoretical Computer Science; Colloquium in Honor Juliani Karhumäki,Hermann Maurer,Grzegorz Rozenber Conference proc

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Results and Trends in Theoretical Computer Science978-3-540-48445-5Series ISSN 0302-9743 Series E-ISSN 1611-3349

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Lecture Notes in Computer Sciencehttp://image.papertrans.cn/r/image/828907.jpg

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Randomness as an invariant for number representations,We show that the usual positional representations of a real number are either random, in the sense of Martin-Löf, for all bases or not so for any base. Thus, randomness is an invariant of number representations. All our proofs are constructive.

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,Cooperating grammars’ systems: Power and parameters,We give an overview on the results obtained about the connection between the power and some parameters of cooperating grammars‘ systems, and propose a method for comparing those CD grammar classes.

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Deciding the NTS property of context-free grammars,An algorithm is presented that is a variation of the one of Senizergues in [4]. It decides the NonTerminal Separation property of context-free grammars in polynomial time. A straightforward generalization of the algorithm decides the NTS property of extended context-free grammars (but not in polynomial time).

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Identities and transductions,Let . be the identity relation on the monoid ... It is shown that the problem . is undecidable for rational transductions .. On the other hand, the problems . and .=. are easily seen to be decidable.

失望昨天

An iteration property of Lindenmayerian power series,We establish an iteration property of Lindenmayerian power series. As an application we derive results on the series generating power of . systems.

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