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ERSHOV
2009
Springer
15 years 4 months ago
On the Containment Problem for Queries in Conjunctive Form with Negation
Abstract. We consider the problem of query containment for conjunctive queries with safe negation property. A necessary and sufficient condition for two queries to be in containmen...
Victor Felea
APLAS
2003
ACM
15 years 3 months ago
Observing Asymmetry and Mismatch
The chi calculus is studied in the framework incorporating two constructions widely useful in applications: asymmetric communication and mismatch condition. The barbed bisimilarity...
Xiaoju Dong, Yuxi Fu
ATAL
2006
Springer
15 years 2 days ago
On proactivity and maintenance goals
Goals are an important concept in intelligent agent systems, and can take a variety of forms. One such form is maintenance goals, which, unlike achievement goals, define states th...
Simon Duff, James Harland, John Thangarajah
FLOPS
2008
Springer
14 years 11 months ago
A Generalization of the Folding Rule for the Clark-Kunen Semantics
Abstract. In this paper, we propose more flexible applicability conditions for the folding rule that increase the power of existing unfold/fold systems for normal logic programs. O...
Javier Álvez, Paqui Lucio
OOPSLA
2005
Springer
15 years 3 months ago
Safe futures for Java
is a simple and elegant abstraction that allows concurrency to be expressed often through a relatively small rewrite of a sequential program. In the absence of side-effects, futur...
Adam Welc, Suresh Jagannathan, Antony L. Hosking