Pattern avoidance in forests of binary shrubs

Bevan, David and Levin, Derek and Nugent, Peter and Pantone, Jay and Pudwell, Lara and Riehl, Manda and Tlachac, ML (2016) Pattern avoidance in forests of binary shrubs. Discrete Mathematics and Theoretical Computer Science, 18 (2). ISSN 1365-8050

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    Abstract

    We investigate pattern avoidance in permutations satisfying some additional restrictions. These are naturally considered in terms of avoiding patterns in linear extensions of certain forest-like partially ordered sets, which we call binary shrub forests. In this context, we enumerate forests avoiding patterns of length three. In four of the five non-equivalent cases, we present explicit enumerations by exhibiting bijections with certain lattice paths bounded above by the line y = ℓx , for some ℓ ∈ Q + , one of these being the celebrated Duchon’s club paths with ℓ = 2/3. In the remaining case, we use the machinery of analytic combinatorics to determine the minimal polynomial of its generating function, and deduce its growth rate.

    Author(s):Bevan, David ORCID logoORCID: https://orcid.org/0000-0001-7179-2285, Levin, Derek, Nugent, Peter, Pantone, Jay, Pudwell, Lara, Riehl, Manda and Tlachac, ML
    Item type:Article
    ID code:58031
    Keywords:pattern avoidance, permutation patterns, linear extensions, Mathematics, Discrete Mathematics and Combinatorics
    Subjects:Science > Mathematics
    Department:Faculty of Science > Computer and Information Sciences
    Depositing user: Pure Administrator
    Date deposited:04 Oct 2016 10:13
    Last modified:25 Oct 2019 04:25
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/58031
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