Maximal perpendicularity in certain Abelian groups

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    We define perpendicularity in an Abelian group G as a binary relation satisfying certain five axioms. Such a relation is maximal if it is not a subrelation of any other perpendicularity in G. A motivation for the study is that the poset (P, ⊆) of all perpendicularities in G is a lattice if G has a unique maximal perpendicularity, and only a meet-semilattice if not. We study the cardinality of the set of maximal perpendicularities and, on the other hand, conditions on the existence of a unique maximal perpendicularity in the following cases: G ≅ ℤn, G is finite, G is finitely generated, and G = ℤ ⊕ ℤ ⊕⋯. A few such conditions are found and a few conjectured. In studying ℝn, we encounter perpendicularity in a vector space.

    Original languageEnglish
    Pages (from-to)235-247
    Number of pages13
    Issue number1
    Publication statusPublished - 2017
    Publication typeA1 Journal article-refereed


    • Abelian group
    • Perpendicularity
    • perpendicularity

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