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» The Complexity of Futile Questioning
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VLDB
1997
ACM
97views Database» more  VLDB 1997»
14 years 1 months ago
The Complexity of Transformation-Based Join Enumeration
Query optimizers that explore a search space exhaustively using transformation rules usually apply all possible rules on each alternative, and stop when no new information is prod...
Arjan Pellenkoft, César A. Galindo-Legaria,...
WWW
2011
ACM
13 years 4 months ago
Differences in the mechanics of information diffusion across topics: idioms, political hashtags, and complex contagion on twitte
There is a widespread intuitive sense that different kinds of information spread differently on-line, but it has been difficult to evaluate this question quantitatively since it ...
Daniel M. Romero, Brendan Meeder, Jon M. Kleinberg
STOC
2005
ACM
130views Algorithms» more  STOC 2005»
14 years 10 months ago
From a static impossibility to an adaptive lower bound: the complexity of early deciding set agreement
Set agreement, where processors decisions constitute a set of outputs, is notoriously harder to analyze than consensus where the decisions are restricted to a single output. This ...
Eli Gafni, Rachid Guerraoui, Bastian Pochon
SYNASC
2005
IEEE
86views Algorithms» more  SYNASC 2005»
14 years 3 months ago
One and Two Polarizations, Membrane Creation and Objects Complexity in P Systems
We improve, by using register machines, some existing universality results for specific models of P systems. P systems with membrane creation are known to generate all recursivel...
Artiom Alhazov, Rudolf Freund, Agustin Riscos-N&ua...
SIAMCOMP
2011
13 years 4 months ago
The Complexity of Early Deciding Set Agreement
Set agreement, where processors decisions constitute a set of outputs, is notoriously harder to analyze than consensus where the decisions are restricted to a single output. This ...
Eli Gafni, Rachid Guerraoui, Bastian Pochon