منابع مشابه
Deciding determinism of unary languages
In this paper, we investigate the complexity of deciding determinism of unary languages. First, we give a method to derive a set of arithmetic progressions from a regular expression E over a unary alphabet, and establish relations between numbers represented by these arithmetic progressions and words in L(E). Next, we define a problem relating to arithmetic progressions and investigate the comp...
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In this paper, we give the complexity of deciding determinism of unary languages. First, we derive a set of arithmetic progressions from an expression E over a unary alphabet, and give the relations between numbers in these arithmetic progressions and words in L(E). Next, we define a problem related to arithmetic progressions and investigate the complexity of this problem. Finally, by reduction...
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Devices of interconnected parallel acting sequential automata are investigated from a language theoretic point of view. Starting with the well-known result that each unary language accepted by a deterministic one-way cellular automaton (OCA) in real time has to be a regular language, we will answer the three natural questions ‘How much time do we have to provide?’ ‘How much power do we have to ...
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Limited automata are one-tape Turing machines that are allowed to rewrite the content of any tape cell only in the first d visits, for a fixed constant d. When d = 1 these models characterize regular languages. An exponential gap between the size of limited automata accepting unary languages and the size of equivalent finite automata is proved. Since a similar gap was already known from unary c...
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We solve the isomorphism problem for certain classes of unary automatic structures: unary automatic equivalence relations, unary automatic linear orders, and unary automatic trees. That is, we provide algorithms which decide whether two given elements of these classes are isomorphic. In doing so, we define new finite representations for these structures which give normal forms. 1
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ژورنال
عنوان ژورنال: Information and Computation
سال: 2015
ISSN: 0890-5401
DOI: 10.1016/j.ic.2015.08.005