Regular tree languages and quasi orders
Regular languages were characterized as sets closed with respect to monotone well-quasi orders. A similar result is proved here for tree languages. Moreover, families of quasi orders that correspond to positive varieties of tree languages and varieties of finite ordered algebras are characterized.
Elmentve itt :
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| Dokumentumtípus: | Cikk |
| Megjelent: |
2006
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| Sorozat: | Acta cybernetica
17 No. 4 |
| Kulcsszavak: | Számítástechnika, Kibernetika |
| Tárgyszavak: | |
| Online Access: | http://acta.bibl.u-szeged.hu/12797 |
| Tartalmi kivonat: | Regular languages were characterized as sets closed with respect to monotone well-quasi orders. A similar result is proved here for tree languages. Moreover, families of quasi orders that correspond to positive varieties of tree languages and varieties of finite ordered algebras are characterized. |
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| Terjedelem/Fizikai jellemzők: | 811-823 |
| ISSN: | 0324-721X |