| D. J. A. Welsh. Matroid Theory. Academic Press, London, 1976. |
.... been used to compute the robustness function for minimum spanning trees [11] shortest paths [12] and to approximate the robustness function for maximum flows in planar graphs [28] Matroid theory provides an elegant structure that captures the essence of a large and important class of problems [23, 24, 29, 32]. There are matroid optimization problems in computational biology [17] graph theory [11, 23] and electrical networks [24, 29] for which only estimates of the input values are available, or for which changes in the input values are expected. The robustness functions for these problems can be ....
....the time bound stated above. For transversal matroids, we give an algorithm that computes the robustness function in =jEj 2) time, where E is the set of edges in the bipartite graph that defines the transversal matroid (see e.g. 13] We prove an extension of Hall s Theorem (see e.g. [32]) for minors of transversal matroids, which allows us to solve the membership problem on their matroid polyhedra by performing one min cut computation over a bipartite graph. Scheduling matroids are a special case of transversal matroids (see e.g. 13] We show how to compute the robustness ....
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D.J.A. Welsh, Matroid Theory, Academic Press, London 1976. 41
....that G cannot be 3 colored. 2 3 Terminology and notation For the purpose of making the presentation as self contained as possible, this section contains a number of standard de nitions mainly from the area of matroid theory. For more thorough introductions to this topic, one may consult [8, 10, 11]. The nite q element eld is denoted by F q , and the n dimensional vector space F n by W n , n 0. In the following, all scalars and entries of vectors and matrices belong to F q , unless explicitly stated otherwise. Unless otherwise speci ed, vectors of dimension n are n 1 matrices ....
....connected if M has precisely one component. The rank of M , denoted by r(M ) is the largest cardinality of any member of I; this is of course precisely the rank of A. The empty matroid is the matroid ( f;g) represented by the empty matrix. In the general axiomatic setting of matroid theory, see [10, 11], there exist matroids which do not originate from matrices, that is, matroids that are not linear. We will not be concerned with the general setting here, and proceed to use the term matroid synonymously with linear matroid . M 1 = E 1 ; I 1 ) and M 2 = E 2 ; I 2 ) are isomorphic, M 1 M 2 ....
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D.J.A. Welsh, Matroid Theory , Academic Press 1976. 42
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D. J. A. Welsh. Matroid Theory. Academic Press, London, 1976.
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Welsh D. J. A. (1976) : Matroid Theory. Academic Press, London.
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D.J.A. Welsh (1976) Matroid Theory. Academic Press, London.
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D.J.A. Welsh. Matroid Theory . Academic Press, London, 1976. 20
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Welsh, D.J.A. (1976) Matroid Theory. Academic Press: London.
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D.J.A. Welsh (1976) Matroid Theory. Academic Press, London.
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WELSH, D.J.A. (1976). Matroid Theory. Academic Press, London.
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D.J.A. Welsh, Matroid Theory (Academic Press, London, New York, San Francisco, 1976).
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Welsh, D. J. A.: Matroid Theory, L. M.S. Monographs, No. 8, Academic Press/Harcourt Brace Jovanovich, London/New York, 1976.
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D.J.A. Welsh. Matroid Theory . Academic Press, London, 1976. 14
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D. J. A. Welsh, Matroid Theory, Academic Press, London, 1976.
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D. J. A. Welsh, Matroid Theory, Academic Press, London, 1976.
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D.J.A. Welsh, Matroid Theory, London: Academic Press, 1976. 23
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D.J.A. Welsh. Matroid Theory. Academic Press, London, 1976.
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D.J.A. Welsh, Matroid Theory, London: Academic Press, 1976. 188
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D. J. A. Welsh, Matroid Theory, Academic Press, London-New York, 1976.
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D. J. A. Welsh, Matroid Theory, Academic Press, London, 1976.
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Dominic J. A. Welsh. Matroid theory. London : Academic Press, 1976.
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D. J. A. Welsh, Matroid Theory, Academic Press, London-New York, 1976.
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Dominic J. A. Welsh. Matroid theory. London : Academic Press, 1976.
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Welsh, D.: Matroid Theory, Academic Press, 1976.
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D.J.A. Welsh, Matroid Theory, Academic Press, London, 1976.
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D. J. A. Welsh, Matroid Theory, Academic Press, London, 1976.
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