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RSA
2011
131views more  RSA 2011»
14 years 6 months ago
On covering by translates of a set
Abstract. In this paper we study the minimal number τ(S, G) of translates of an arbitrary subset S of a group G needed to cover the group, and related notions of the efficiency of...
Béla Bollobás, Svante Janson, Oliver...
DIAGRAMS
2000
Springer
15 years 4 months ago
On the Completeness and Expressiveness of Spider Diagram Systems
Spider diagram systems provide a visual language that extends the popular and intuitive Venn diagrams and Euler circles. Designed to complement object-oriented modelling notations ...
John Howse, Fernando Molina, John Taylor
ECCC
2006
90views more  ECCC 2006»
14 years 11 months ago
Comparing Reductions to NP-Complete Sets
Under the assumption that NP does not have p-measure 0, we investigate reductions to NP-complete sets and prove the following: (1) Adaptive reductions are more powerful than nonad...
John M. Hitchcock, Aduri Pavan
JDA
2007
83views more  JDA 2007»
14 years 11 months ago
Optimal leaf ordering of complete binary trees
Ordering a set of items so as to minimize the sum of distances between consecutive elements is a fundamental optimization problem occurring in many settings. While it is NP-hard i...
Ulrik Brandes
JSC
2010
102views more  JSC 2010»
14 years 10 months ago
Equational approximations for tree automata completion
In this paper we deal with the verification of safety properties of infinite-state systems modeled by term-rewriting systems. An over-approximation of the set of reachable terms...
Thomas Genet, Vlad Rusu