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*-μ-semirings and *-λ-semirings.
Feng Feng
Xianzhong Zhao
Young Bae Jun
Published in:
Theor. Comput. Sci. (2005)
Keyphrases
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constraint satisfaction problems
containment of conjunctive queries
multi agent systems
data analysis
data mining
metadata
relational databases
np hard
distributed systems
np complete
rdf graphs