Khaled Elbassioni - On Dualization over Distributive Lattices

dmtcs:6742 - Discrete Mathematics & Theoretical Computer Science, October 27, 2022, vol. 24, no 2 - https://doi.org/10.46298/dmtcs.6742
On Dualization over Distributive Lattices

Authors: Khaled Elbassioni

    Given a partially order set (poset) $P$, and a pair of families of ideals $\mathcal{I}$ and filters $\mathcal{F}$ in $P$ such that each pair $(I,F)\in \mathcal{I}\times\mathcal{F}$ has a non-empty intersection, the dualization problem over $P$ is to check whether there is an ideal $X$ in $P$ which intersects every member of $\mathcal{F}$ and does not contain any member of $\mathcal{I}$. Equivalently, the problem is to check for a distributive lattice $L=L(P)$, given by the poset $P$ of its set of joint-irreducibles, and two given antichains $\mathcal{A},\mathcal{B}\subseteq L$ such that no $a\in\mathcal{A}$ is dominated by any $b\in\mathcal{B}$, whether $\mathcal{A}$ and $\mathcal{B}$ cover (by domination) the entire lattice. We show that the problem can be solved in quasi-polynomial time in the sizes of $P$, $\mathcal{A}$ and $\mathcal{B}$, thus answering an open question in Babin and Kuznetsov (2017). As an application, we show that minimal infrequent closed sets of attributes in a rational database, with respect to a given implication base of maximum premise size of one, can be enumerated in incremental quasi-polynomial time.


    Volume: vol. 24, no 2
    Section: Discrete Algorithms
    Published on: October 27, 2022
    Accepted on: September 22, 2022
    Submitted on: August 29, 2020
    Keywords: Computer Science - Discrete Mathematics

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