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    EJC
    2006
    111views Information Technology» more  EJC 2006»
    The topology of the independence complex
    14 years 9 months ago
    The topology of the independence complex
    Download  www.ms.uky.edu
    We introduce a large self-dual class of simplicial complexes for which we show that each member complex is contractible or homotopy equivalent to a sphere. Examples of complexes i...
    Richard Ehrenborg, Gábor Hetyei
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    EJC
    2006
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    Two oiseau decompositions of permutations and their application to Eulerian calculus
    14 years 9 months ago
    Two oiseau decompositions of permutations and their application to Eulerian calculus
    Download  www-irma.u-strasbg.fr
    : Two transformations are constructed that map the permutation group onto a well-defined subset of a partially commutative monoid generated by the so-called oiseaux. Those transfor...
    Dominique Foata, Arthur Randrianarivony
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    EJC
    2006
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    On the canonical metric representation, average distance, and partial Hamming graphs
    14 years 9 months ago
    On the canonical metric representation, average distance, and partial Hamming graphs
    Download  www.fmf.uni-lj.si
    Average distance of a graph is expressed in terms of its canonical metric representation. The equality can be modified to an inequality in such a way that it characterizes isometr...
    Sandi Klavzar
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    EJC
    2006
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    Hadamard ideals and Hadamard matrices with two circulant cores
    14 years 9 months ago
    Hadamard ideals and Hadamard matrices with two circulant cores
    Download  www.uow.edu.au
    We apply Computational Algebra methods to the construction of Hadamard matrices with two circulant cores, given by Fletcher, Gysin and Seberry. We introduce the concept of Hadamar...
    Ilias S. Kotsireas, Christos Koukouvinos, Jennifer...
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    EJC
    2006
    77views Information Technology» more  EJC 2006»
    Invariant subspaces, duality, and covers of the Petersen graph
    14 years 9 months ago
    Invariant subspaces, duality, and covers of the Petersen graph
    Download  www.fmf.uni-lj.si
    A general method for finding elementary abelian regular covering projections of finite connected graphs is applied to the Petersen graph. As a result, a complete list of pairwise ...
    Aleksander Malnic, Primoz Potocnik
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