Property Testing of Regular Tree Languages
✍ Scribed by Frédéric Magniez; Michel de Rougemont
- Publisher
- Springer
- Year
- 2007
- Tongue
- English
- Weight
- 491 KB
- Volume
- 49
- Category
- Article
- ISSN
- 0178-4617
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We show that a tree language recognized by a deterministic parity automaton is either hard for the co-B uchi level and therefore cannot be recognized by a weak alternating automaton, or is on a very low level in the hierarchy of weak alternating automata. A topological counterpart of this property i
A language is regular if it can be recognized by a ÿnite automaton. According to the pumping lemma, every inÿnite regular language contains a regular subset of the form uv + w, where u; v; w are words and v is not empty. It is known that every regular language can be expressed as ( i∈I uiv + i wi) ∪