Results 31 to 40 of about 4,399 (316)
Minimization of visibly pushdown automata is NP-complete [PDF]
Logical Methods in Computer Science, 2020 We show that the minimization of visibly pushdown automata is NP-complete. This result is obtained by introducing immersions, that recognize multiple languages (over a usual, non-visible alphabet) using a common deterministic transition graph, such that ...
Olivier Gauwin +2 more
doaj +1 more source
Watson-Crick conjugates of words and languages [PDF]
Discrete Mathematics & Theoretical Computer ScienceIn this work, we explore the concept of Watson-Crick conjugates, also known as $θ$-conjugates (where $θ$ is an antimorphic involution), of words and languages.
Kalpana Mahalingam, Anuran Maity
doaj +1 more source
Most Complex Regular Ideal Languages [PDF]
Discrete Mathematics & Theoretical Computer Science, 2016 A right ideal (left ideal, two-sided ideal) is a non-empty language $L$ over an alphabet $\Sigma$ such that $L=L\Sigma^*$ ($L=\Sigma^*L$, $L=\Sigma^*L\Sigma^*$). Let $k=3$ for right ideals, 4 for left ideals and 5 for two-sided ideals. We show that there
Janusz Brzozowski +2 more
doaj +1 more source
Decidability of multiset, set and numerically decipherable directed figure codes [PDF]
Discrete Mathematics & Theoretical Computer Science, 2017 Codes with various kinds of decipherability, weaker than the usual unique decipherability, have been studied since multiset decipherability was introduced in mid-1980s.
Włodzimierz Moczurad
doaj +1 more source
Edit Distance for Pushdown Automata [PDF]
Logical Methods in Computer Science, 2017 The edit distance between two words $w_1, w_2$ is the minimal number of word operations (letter insertions, deletions, and substitutions) necessary to transform $w_1$ to $w_2$.
Krishnendu Chatterjee +3 more
doaj +1 more source
Functional Automata - Formal Languages for Computer Science Students [PDF]
TFPIE, 2014 An introductory formal languages course exposes advanced undergraduate and early graduate students to automata theory, grammars, constructive proofs, computability, and decidability.
Marco T. Morazán, Rosario Antunez
semanticscholar +1 more source
On Separation by Locally Testable and Locally Threshold Testable Languages [PDF]
Logical Methods in Computer Science, 2014 A separator for two languages is a third language containing the first one and disjoint from the second one. We investigate the following decision problem: given two regular input languages, decide whether there exists a locally testable (resp. a locally
Thomas Place +2 more
doaj +1 more source
Synthesis of Data Word Transducers [PDF]
Logical Methods in Computer Science, 2021 In reactive synthesis, the goal is to automatically generate an implementation from a specification of the reactive and non-terminating input/output behaviours of a system. Specifications are usually modelled as logical formulae or automata over infinite
Léo Exibard +2 more
doaj +1 more source
Minimality Notions via Factorization Systems and Examples [PDF]
Logical Methods in Computer Science, 2022 For the minimization of state-based systems (i.e. the reduction of the number of states while retaining the system's semantics), there are two obvious aspects: removing unnecessary states of the system and merging redundant states in the system.
Thorsten Wißmann
doaj +1 more source