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IPL
2008
79views more  IPL 2008»
13 years 8 months ago
On the efficient construction of quasi-reversible automata for reversible languages
Quasi-reversible automata is a suitable representation for reversible languages. In this work a method is proposed to obtain such an automaton for any given reversible language re...
Pedro García, Manuel Vazquez de Parga, Dami...
IJHPCA
2006
75views more  IJHPCA 2006»
13 years 8 months ago
Scheduling Multiple Divisible Loads
In this paper we study the scheduling of multiple divisible loads on a star network of processors. We show that this problem is computationally hard. Special cases solvable in pol...
Maciej Drozdowski, Marcin Lawenda, Fréd&eac...
ITA
2008
147views Communications» more  ITA 2008»
13 years 8 months ago
A morphic approach to combinatorial games: the Tribonacci case
We propose a variation of Wythoff's game on three piles of tokens, in the sense that the losing positions can be derived from the Tribonacci word instead of the Fibonacci word...
Éric Duchêne, Michel Rigo
NETWORKS
2006
13 years 8 months ago
Lower bounds for the relative greedy algorithm for approximating Steiner trees
Abstract. The Steiner tree problem is to find a shortest subgraph that spans a given set of vertices in a graph. This problem is known to be NP-hard and it is well known that a pol...
Stefan Hougardy, Stefan Kirchner
CORR
2000
Springer
85views Education» more  CORR 2000»
13 years 8 months ago
Phutball Endgames are Hard
We show that, in John Conway's board game Phutball (or Philosopher's Football), it is NP-complete to determine whether the current player has a move that immediately wins...
Erik D. Demaine, Martin L. Demaine, David Eppstein