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Closure properties of deterministic indexed languages

โœ Scribed by R. Parchmann; J. Duske; J. Specht


Book ID
114037519
Publisher
Elsevier Science
Year
1980
Weight
787 KB
Volume
46
Category
Article
ISSN
0019-9958

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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