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Explorable automata


We define the class of explorable automata on finite or infinite words. This is a generalization of History-Deterministic (HD) automata, where this time non-deterministic choices can be resolved by building finitely many simultaneous runs instead of just one. We show that recognizing HD automata among explorable ones is in PTime, thereby giving a strong link between the two notions. We then show that recognizing explorable automata is ExpTime-complete, in the case of finite words or Büchi automata. Additionally, we define the notion of ω-explorable automata on infinite words, where countably many runs can be used to resolve the non-deterministic choices. We show that all reachability automata are ω-explorable, but this is not the case for safety ones. We finally show ExpTime-completeness for ω-explorability of automata on infinite words, covering the safety and co-Büchi acceptance conditions.
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Dates and versions

hal-03669659 , version 1 (16-05-2022)
hal-03669659 , version 2 (08-11-2022)


  • HAL Id : hal-03669659 , version 2


Emile Hazard, Denis Kuperberg. Explorable automata. 2022. ⟨hal-03669659v2⟩
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