Idempotent Varieties of Incidence Monoids and Bipartite Posets

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The algebraic variety defined by the idempotents of an incidence monoid is investigated. Its irreducible components are determined. The intersection with an antichain submonoid is shown to be the union of these irreducible components. The antichain monoids of bipartite posets are shown to be orthodox semigroups. The Green’s relations are explicitly determined, and applications to conjugacy problems are described. In particular, it is shown that two elements in the antichain monoid are primarily conjugate in the monoid if and only if they belong to the same -class and their multiplication by an idempotent of the same -class gives conjugate elements in the group.

Original languageEnglish
Number of pages26
Journal Algebras and Representation Theory
Early online date3 Sept 2022
Publication statusPublished - Oct 2023


  • Antichain monoids
  • Bipartite posets
  • Orthodox semigroups
  • Completely regular semigroups
  • Regular semigroups
  • Conjugacy relations


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