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    EJC
    2008
    113views Information Technology» more  EJC 2008»
    Constructive characterizations of 3-connected matroids of path width three
    13 years 11 months ago
    Constructive characterizations of 3-connected matroids of path width three
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    A matroid M is sequential or has path width 3 if M is 3-connected and its ground set has a sequential ordering, that is, an ordering (e1, e2, . . . , en) such that ({e1, e2, . . . ...
    Brian Beavers, James Oxley
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    EJC
    2008
    114views Information Technology» more  EJC 2008»
    On a class of finite symmetric graphs
    13 years 11 months ago
    On a class of finite symmetric graphs
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    Let be a G-symmetric graph, and let B be a nontrivial G-invariant partition of the vertex set of . This paper aims to characterize (, G) under the conditions that the quotient gr...
    Sanming Zhou
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    EJC
    2008
    114views Information Technology» more  EJC 2008»
    Locating sensors in paths and cycles: The case of 2-identifying codes
    13 years 11 months ago
    Locating sensors in paths and cycles: The case of 2-identifying codes
    Download  www.cc.gatech.edu
    For a graph G and a set D V (G), define Nr[x] = {xi V (G) : d(x, xi) r} (where d(x, y) is graph theoretic distance) and Dr(x) = Nr[x] D. D is known as an r-identifying code if...
    David L. Roberts, Fred S. Roberts
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    EJC
    2008
    89views Information Technology» more  EJC 2008»
    Compatible decompositions and block realizations of finite metrics
    14 years 15 days ago
    Compatible decompositions and block realizations of finite metrics
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    Andreas W. M. Dress, Katharina T. Huber, Jacobus H...
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    EJC
    2008
    76views Information Technology» more  EJC 2008»
    On the automorphism groups of symmetric graphs admitting an almost simple group
    14 years 15 days ago
    On the automorphism groups of symmetric graphs admitting an almost simple group
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    Xin Gui Fang, Lu Jun Jia, Jie Wang
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    EJC
    2008
    82views Information Technology» more  EJC 2008»
    Partial ovoids and partial spreads in symplectic and orthogonal polar spaces
    14 years 15 days ago
    Partial ovoids and partial spreads in symplectic and orthogonal polar spaces
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    We present improved lower bounds on the sizes of small maximal partial ovoids and small maximal partial spreads in the classical symplectic and orthogonal polar spaces, and improv...
    Jan De Beule, Andreas Klein, Klaus Metsch, Leo Sto...
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    EJC
    2008
    139views Information Technology» more  EJC 2008»
    Majority constraints have bounded pathwidth duality
    14 years 15 days ago
    Majority constraints have bounded pathwidth duality
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    We study certain constraint satisfaction problems which are the problems of deciding whether there exists a homomorphism from a given relational structure to a fixed structure with...
    Víctor Dalmau, Andrei A. Krokhin
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    EJC
    2008
    91views Information Technology» more  EJC 2008»
    On the number of combinations without certain separations
    14 years 15 days ago
    On the number of combinations without certain separations
    Download  math.haifa.ac.il
    Abstract. In this paper we enumerate the number of ways of selecting k objects from n objects arrayed in a line such that no two selected ones are separated by m-1, 2m-1,
    Toufik Mansour, Yidong Sun
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    EJC
    2008
    98views Information Technology» more  EJC 2008»
    Graph parameters and semigroup functions
    14 years 15 days ago
    Graph parameters and semigroup functions
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    Abstract. We prove a general theorem on semigroup functions that implies characterizations of graph partition functions in terms of the positive semidefiniteness (`reflection posit...
    László Lovász, Alexander Schr...
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    EJC
    2008
    85views Information Technology» more  EJC 2008»
    Block transitivity and degree matrices
    14 years 15 days ago
    Block transitivity and degree matrices
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    José Soto, Jirí Fiala
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