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» On the Theory of Structural Subtyping
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SIGLEX
1991
15 years 10 months ago
Aspectual Requirements of Temporal Connectives: Evidence for a Two-Level Approach to Semantics
This paper argues for a two-level theory of semantics as opposed to a one-level theory, based on the example of the system of temporal and durationM connectives. Instead of identi...
Michael Herweg
PODS
2004
ACM
139views Database» more  PODS 2004»
16 years 6 months ago
On Preservation under Homomorphisms and Unions of Conjunctive Queries
Unions of conjunctive queries, also known as select-project-join-union queries, are the most frequently asked queries in relational database systems. These queries are definable b...
Albert Atserias, Anuj Dawar, Phokion G. Kolaitis

Lecture Notes
2225views
17 years 4 months ago
Microeconomics
The main objective of the course is for students to be able to analyze problems in microeconomic theory at the beginning graduate level. Students successfully completing the course...
Arne Hallam
ACS
2007
15 years 6 months ago
Algebra and Geometry of Rewriting
We present various results of the last twenty years converging towards a homotopical theory of computation. This new theory is based on two crucial notions : polygraphs (introduce...
Yves Lafont
IAT
2010
IEEE
15 years 4 months ago
Modeling Dynamic Groups for Agent-Based Pedestrian Crowd Simulations
Group modeling is still an open challenge problem in pedestrian crowd simulations. Most existing work is based on socio-psychological models which can only describe the dynamics o...
Fasheng Qiu, Xiaolin Hu