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» Optimal query complexity bounds for finding graphs
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POPL
2000
ACM
14 years 57 min ago
(Optimal) Duplication is not Elementary Recursive
In 1998 Asperti and Mairson proved that the cost of reducing a lambda-term using an optimal lambda-reducer (a la L´evy) cannot be bound by any elementary function in the number o...
Andrea Asperti, Paolo Coppola, Simone Martini
CORR
2010
Springer
180views Education» more  CORR 2010»
13 years 5 months ago
Shortest path problem in rectangular complexes of global nonpositive curvature
Abstract. CAT(0) metric spaces constitute a far-reaching common generalization of Euclidean and hyperbolic spaces and simple polygons: any two points x and y of a CAT(0) metric spa...
Victor Chepoi, Daniela Maftuleac
VLDB
2006
ACM
147views Database» more  VLDB 2006»
14 years 7 months ago
Answering queries using materialized views with minimum size
In this paper we study the following problem. Given a database and a set of queries, we want to find a set of views that can compute the answers to the queries, such that the amoun...
Rada Chirkova, Chen Li, Jia Li
VLDB
2002
ACM
106views Database» more  VLDB 2002»
13 years 7 months ago
Structure and Value Synopses for XML Data Graphs
All existing proposals for querying XML (e.g., XQuery) rely on a pattern-specification language that allows (1) path navigation and branching through the label structure of the XM...
Neoklis Polyzotis, Minos N. Garofalakis
ICC
2009
IEEE
190views Communications» more  ICC 2009»
13 years 5 months ago
Low Bound of Energy-Latency Trade-Off of Opportunistic Routing in Multi-Hop Networks
During the last decade, many works were devoted to improving the performance of relaying techniques in ad hoc networks. One promising approach consists in allowing the relay nodes ...
Ruifeng Zhang, Jean-Marie Gorce, Katia Jaffr&egrav...