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    COMBINATORICS
    1999
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    Deformation of Chains via a Local Symmetric Group Action
    14 years 2 months ago
    Deformation of Chains via a Local Symmetric Group Action
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    A symmetric group action on the maximal chains in a finite, ranked poset is local if the adjacent transpositions act in such a way that (i, i + 1) sends each maximal chain either ...
    Patricia Hersh
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    EJC
    2006
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    Poset edge-labellings and left modularity
    14 years 2 months ago
    Poset edge-labellings and left modularity
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    It is known that a graded lattice of rank n is supersolvable if and only if it has an EL-labelling where the labels along any maximal chain are exactly the numbers 1, 2, . . . , n ...
    Peter McNamara, Hugh Thomas
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