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Dualization in Lattices Given by Implicational Bases

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Formal Concept Analysis (ICFCA 2019)

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Abstract

It was recently proved that the dualization in lattices given by implicational bases is impossible in output-polynomial time unless \(\mathsf{P}\!=\!\mathsf{NP}\). In this paper, we show that this result holds even when the premises in the implicational base are of size at most two. In the case of premises of size one—when the lattice is distributive—we show that the dualization is possible in output quasi-polynomial time whenever the graph of implications is of bounded maximum induced matching. Lattices that share this property include distributive lattices coded by the ideals of an interval order.

This work has been supported by the ANR project GraphEn ANR-15-CE40-0009.

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Notes

  1. 1.

    Here the graph of implications is considered directed, where there is an arc (ab) in \(G(\varSigma )\) if there exists \(A\rightarrow b\in \varSigma \), \(a\in A\), and the implicational base is said to be acyclic if its graph of implications is; see [22].

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Correspondence to Oscar Defrain .

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Defrain, O., Nourine, L. (2019). Dualization in Lattices Given by Implicational Bases. In: Cristea, D., Le Ber, F., Sertkaya, B. (eds) Formal Concept Analysis. ICFCA 2019. Lecture Notes in Computer Science(), vol 11511. Springer, Cham. https://doi.org/10.1007/978-3-030-21462-3_7

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  • DOI: https://doi.org/10.1007/978-3-030-21462-3_7

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