Titlebook: Reviews of Environmental Contamination and Toxicology 191; George Ware Book 2007 Springer-Verlag New York 2007 Reviews of Environmental Co

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Reviews of Environmental Contamination and Toxicology 191

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rocedures. Its runtime is .(...), matching the best known, due to Gabow. We then consider the function .(.) which is the maximurn value such that every weighted directed graph whose minimum weight of a directed cut is at least ., admits a weighted packing of .(.) dijoins (a weighted packing means th

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Ricardo Barra,Caroline Castillo,Joao Paulo Machado Torresl path in the algorithm; these results complement and reinforce that conclusion..For the sparse case, both theory and some new experimental measurements, reported here, make the same point: for column-oriented distributed methods, the number of gridpoints (which is .(.)) must grow as .. in order to

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Wim de Vries,Paul F. A. M. R?mkens,Gudrun Schützehat . . ≥ ... ≥ . . ≥ . . are valid for (a) bipartite graphs; (b) quasi-regularizable graphs on 2. vertices..In particular, we infer that these inequalities are true for (a) trees, thus doing a step in an attempt to prove the conjecture of Alavi .; (b) very well-covered graphs. Consequently, for the

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ascinating example of the interplay between pure mathematics and the applied problems generated by software and hardware engineers. The wide range of mathematical techniques used, and the often unexpected applications of combinatorial covering suites make for a rewarding study.

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set of arcs, called a ., must intersect every directed cut. Lucchesi and Younger gave a min-max theorem for the problem of finding a mininmum cost dijoin. Less understood is the extent to which dijoins pack. One difliculty is that dijoins are not as easily visualized as other combinatorial objects s

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Ricardo Barra,Caroline Castillo,Joao Paulo Machado Torres such a way that the size of the data structures increases linearly with the number of processors. In this paper we show that the column-oriented approach to sparse Cholesky for distributed-memory machines is not scalable. By considering message volume, node contention, and bisection width, one may