Titlebook: Language and Automata Theory and Applications; 6th International Co Adrian-Horia Dediu,Carlos Martín-Vide Conference proceedings 2012 Sprin

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Strong Termination for Gap-Order Constraint Abstractions of Counter Systemsich constraints (over ℤ) between the variables of the source state and the target state of a transition are . (.) [18]. . extend monotonicity constraint systems [4], integral relation automata [9], and constraint automata in [12]. Since . are infinitely-branching, termination does not imply ., i.e.

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Approximate Regular Expressions and Their Derivatives given language. In this paper, we introduce a new family of regular operators based on a generalization of the notion of distance and we define a new family of expressions, the .. We compute Brzozowski derivatives and Antimirov derivatives of such operators, which allows us to provide two recognize

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Conservative Groupoids Recognize Only Regular Languagesoperation ‘·’ which is not necessarily associative. It is well known that . can be recognized by a groupoid iff . is context-free. But it is also known that some subclasses of groupoids can only recognize regular languages. For example, . recognize exactly the regular open languages and Beaudry et a

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0302-9743 national Conference on Language and Automata Theory and Applications, LATA 2012, held in A Coruña, Spain in March 2012. The 41 revised full papers presented together with 3 invited talks and 2 invited tutorials were carefully reviewed and selected from 114 initial submissions. The volume features co

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The Minimal Cost Reachability Problem in Priced Timed Pushdown Systemsget set of configurations, determine the minimal possible cost of any run from the initial to a target configuration. We solve the problem by reducing it to the reachability problem in standard pushdown systems.