Colin Defant - Postorder Preimages

dmtcs:1428 - Discrete Mathematics & Theoretical Computer Science, February 6, 2017, Vol. 19 no. 1 -
Postorder PreimagesArticle

Authors: Colin Defant

    Given a set $Y$ of decreasing plane trees and a permutation $\pi$, how many trees in $Y$ have $\pi$ as their postorder? Using combinatorial and geometric constructions, we provide a method for answering this question for certain sets $Y$ and all permutations $\pi$. We then provide applications of our results to the study of the deterministic stack-sorting algorithm.

    Volume: Vol. 19 no. 1
    Section: Combinatorics
    Published on: February 6, 2017
    Accepted on: January 31, 2017
    Submitted on: February 2, 2017
    Keywords: Mathematics - Combinatorics,05A19, 05C05

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