Titlebook: ;

fatuity

On Minimum Diameter Spanning Trees under Reload Costs,pending on the colors of the pair of edges used by a walk through the node..In this paper we consider the problem of finding a spanning tree of minimum diameter with respect to the underlying reload costs. We present hardness results and lower bounds for the approximability even on graphs with maxim

營養(yǎng)

Induced Matchings in Regular Graphs and Trees,s in a regular graph of degree . can be approximated with a performance ratio less than .. However MIM is NP-hard to approximate within some constant . > 1 even if the input is restricted to various classes of bounded degree and regular graphs. Finally we describe a simple algorithm providing a line

有毛就脫毛

Mod-2 Independence and Domination in Graphs,n number of arcs into the subset. This algorithm allows us to give a combinatorial interpretation of Gauss-Jordan and Gauss elimination on square boolean matrices. In addition to solving this independence-mod-2 (even) set existence problem we also give efficient algorithms for related domination-mod

閑聊

NLC2-Decomposition in Polynomial Time,ertices using the operations in question. The width of the decomposition is the number of labels used, and the NLC-width of the graph is the smallest width among its NLC-decompositions. Many difficult graph problems can be solved efficiently with dynamic programming if an NLC-decomposition of low wi

Chauvinistic

sed-rate

LEER

expeditious

finale

我就不公正

Routing Permutations in the Hypercube,Using the computer, we show that for . . and for any permutation on its vertices, there exists a system of pairwise arc-disjoint directed paths from each vertex to its target in the permutation. This gives the answer to Szymanski’s conjecture [.] for dimension 4. In addition to this study, we consid