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    EJC
    2008
    120views Information Technology» more  EJC 2008»
    Linked partitions and linked cycles
    14 years 9 months ago
    Linked partitions and linked cycles
    Download  www.billchen.org
    The notion of noncrossing linked partition arose from the study of certain transforms in free probability theory. It is known that the number of noncrossing linked partitions of [...
    William Y. C. Chen, Susan Y. J. Wu, Catherine H. Y...
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    EJC
    2008
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    Grad and classes with bounded expansion III. Restricted graph homomorphism dualities
    14 years 9 months ago
    Grad and classes with bounded expansion III. Restricted graph homomorphism dualities
    Download  iti.mff.cuni.cz
    We study restricted homomorphism dualities in the context of classes with bounded expansion. This presents a generalization of restricted dualities obtained earlier for bounded deg...
    Jaroslav Nesetril, Patrice Ossona de Mendez
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    EJC
    2008
    101views Information Technology» more  EJC 2008»
    Some existence and construction results of polygonal designs
    14 years 9 months ago
    Some existence and construction results of polygonal designs
    Download  orion.math.iastate.edu
    This paper revisits the existence and construction problems for polygonal designs (a special class of partially balanced incomplete block designs associated with regular polygons)...
    Gargi Bhattacharyya, John Hegeman, Joohyung Kim, J...
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    EJC
    2008
    70views Information Technology» more  EJC 2008»
    Substitution tilings with statistical circular symmetry
    14 years 9 months ago
    Substitution tilings with statistical circular symmetry
    Download  www.mathematik.uni-bielefeld.de
    Two new series of substitution tilings are introduced in which the tiles appear in infinitely many orientations. It is shown that several properties of the well-known pinwheel tili...
    Dirk Frettlöh
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    EJC
    2008
    114views Information Technology» more  EJC 2008»
    Catalan and Motzkin numbers modulo 4 and 8
    14 years 9 months ago
    Catalan and Motzkin numbers modulo 4 and 8
    Download  www.math.sinica.edu.tw
    In this paper, we compute the congruences of Catalan and Motzkin numbers modulo 4 and 8. in particular, we prove the conjecture proposed by Deutsch and Sagan that no Motzkin numbe...
    Sen-Peng Eu, Shu-Chung Liu, Yeong-Nan Yeh
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