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    EJC
    2008
    86views Information Technology» more  EJC 2008»
    Generalised dualities and maximal finite antichains in the homomorphism order of relational structures
    14 years 15 days ago
    Generalised dualities and maximal finite antichains in the homomorphism order of relational structures
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    The motivation for this paper is three-fold. First, we study the connectivity properties of the homomorphism order of directed graphs, and more generally for relational structures...
    Jan Foniok, Jaroslav Nesetril, Claude Tardif
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    EJC
    2008
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    Genocchi numbers and f-vectors of simplicial balls
    14 years 15 days ago
    Genocchi numbers and f-vectors of simplicial balls
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    Sven Herrmann
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    EJC
    2008
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    Coloring squares of planar graphs with girth six
    14 years 15 days ago
    Coloring squares of planar graphs with girth six
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    Wang and Lih conjectured that for every g 5, there exists a number M(g) such that the square of a planar graph G of girth at least g and maximum degree M(g) is (+1)-colorable. ...
    Zdenek Dvorak, Daniel Král, Pavel Nejedl&ya...
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    EJC
    2008
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    The upper bound on k-tuple domination numbers of graphs
    14 years 15 days ago
    The upper bound on k-tuple domination numbers of graphs
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    Gerard J. Chang
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    EJC
    2008
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    Partitions and Clifford algebras
    14 years 15 days ago
    Partitions and Clifford algebras
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    Given the set [n] = {1, . . . , n} for positive integer n, combinatorial properties of Clifford algebras are exploited to count partitions and nonoverlapping partitions of [n]. Th...
    René Schott, G. Stacey Staples
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    EJC
    2008
    79views Information Technology» more  EJC 2008»
    On Postnikov's hook length formula for binary trees
    14 years 15 days ago
    On Postnikov's hook length formula for binary trees
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    We present a combinatorial proof of Postnikov's hook length formula for binary trees. c 2007 Elsevier Ltd. All rights reserved. Let [n] = {1, 2, . . . , n}. It is well known ...
    William Y. C. Chen, Laura L. M. Yang
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    EJC
    2008
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    Fractional chromatic number of distance graphs generated by two-interval sets
    14 years 15 days ago
    Fractional chromatic number of distance graphs generated by two-interval sets
    Download  www.math.nsysu.edu.tw
    Let D be a set of positive integers. The distance graph generated by D, denoted by G(Z, D), has the set Z of all integers as the vertex Supported in part by the National Science ...
    Daphne Der-Fen Liu, Xuding Zhu
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    EJC
    2008
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    Deforming Meyer sets
    14 years 15 days ago
    Deforming Meyer sets
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    A linear deformation of a Meyer set M in Rd is the image of M under a group homomorphism of the group [M] generated by M into Rd . We provide a necessary and sufficient condition f...
    Jeong-Yup Lee, Robert V. Moody
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    EJC
    2008
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    Expansion properties of a random regular graph after random vertex deletions
    14 years 15 days ago
    Expansion properties of a random regular graph after random vertex deletions
    Download  web.maths.unsw.edu.au
    We investigate the following vertex percolation process. Starting with a random regular graph of constant degree, delete each vertex independently with probability p, where p = n-...
    Catherine S. Greenhill, Fred B. Holt, Nicholas C. ...
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    EJC
    2008
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    Multiple Kronecker covering graphs
    14 years 15 days ago
    Multiple Kronecker covering graphs
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    A graph may be the Kronecker cover in more than one way. In this note we explore this phenomenon and apply it to show that the minimal common cover of two graphs need not be uniqu...
    Wilfried Imrich, Tomaz Pisanski
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