Some Weak Fragments of HA and Certain Closure Properties.

Morteza Moniri Mojtaba Moniri

Published in: J. Symb. Log. (2002)

Keyphrases

closure properties
expressive power
tree automata
context free grammars
context free
conjunctive queries
database
query language
structural properties
artificial intelligence
finite automata
information retrieval
database systems
expert systems
matching algorithm