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DAM
2006
66views more  DAM 2006»
15 years 3 months ago
On the structure of the adjacency matrix of the line digraph of a regular digraph
We show that the adjacency matrix M of the line digraph of a d-regular digraph D on n vertices can be written as M = AB, where the matrix A is the Kronecker product of the all-one...
Simone Severini
DAM
2006
118views more  DAM 2006»
15 years 3 months ago
Maximizing breaks and bounding solutions to the mirrored traveling tournament problem
We investigate the relation between two aspects of round robin tournament scheduling problems: breaks and distances. The distance minimization problem and the breaks maximization ...
Sebastián Urrutia, Celso C. Ribeiro
DAM
2007
77views more  DAM 2007»
15 years 3 months ago
Decompositions of graphs of functions and fast iterations of lookup tables
We show that every function f implemented as a lookup table can be implemented such that the computational complexity of evaluating f m(x) is small, independently of m and x. The ...
Boaz Tsaban
DAM
2007
91views more  DAM 2007»
15 years 3 months ago
A note on the precedence-constrained class sequencing problem
We give a short proof of a result of Tovey [6] on the inapproximability of a scheduling problem known as precedence constrained class sequencing. In addition, we present an approxi...
José R. Correa, Samuel Fiorini, Nicol&aacut...
DAM
2007
79views more  DAM 2007»
15 years 3 months ago
Recognizing splicing languages: Syntactic monoids and simultaneous pumping
We use syntactic monoid methods, together with an enhanced pumping lemma, to investigate the structure of splicing languages. We obtain an algorithm for deciding whether a regular...
Elizabeth Goode, Dennis Pixton