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CP
2007
Springer
15 years 11 months ago
Groupoids and Conditional Symmetry
We introduce groupoids – generalisations of groups in which not all pairs of elements may be multiplied, or, equivalently, categories in which all morphisms are invertible – as...
Ian P. Gent, Tom Kelsey, S. A. Linton, J. Pearson,...
CP
2007
Springer
15 years 11 months ago
A Compression Algorithm for Large Arity Extensional Constraints
We present an algorithm for compressing table constraints representing allowed or disallowed tuples. This type of constraint is used for example in configuration problems, where t...
George Katsirelos, Toby Walsh
CPAIOR
2007
Springer
15 years 11 months ago
A Position-Based Propagator for the Open-Shop Problem
The Open-Shop Problem is a hard problem that can be solved using Constraint Programming or Operation Research methods. Existing techniques are efficient at reducing the search tree...
Jean-Noël Monette, Yves Deville, Pierre Dupon...
ICALP
2007
Springer
15 years 11 months ago
Low Distortion Spanners
A spanner of an undirected unweighted graph is a subgraph that approximates the distance metric of the original graph with some specified accuracy. Specifically, we say H ⊆ G i...
Seth Pettie
133
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ICALP
2007
Springer
15 years 11 months ago
Private Multiparty Sampling and Approximation of Vector Combinations
We consider the problem of private efficient data mining of vertically-partitioned databases. Each of several parties holds a column of a data matrix (a vector) and the parties wan...
Yuval Ishai, Tal Malkin, Martin J. Strauss, Rebecc...