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1 results

  • Chapter 7 - Examples of bimonoids

  • from Part II - Basic theory of bimonoids
  • Marcelo Aguiar, Swapneel Mahajan
  • Book:
    Bimonoids for Hyperplane Arrangements
    Published online:
    28 February 2020
    Print publication:
    19 March 2020, pp 283-334

  • Summary

    We discuss some basic and important examples of species (relative to a fixed hyperplane arrangement). These include the exponential species, signed exponential species, species of chambers, species of faces, species of flats, species of top-nested faces, species of top-lunes, species of bifaces. They are constructed from well-known objects associated to an arrangement such as faces, flats, chambers, top-nested faces, top-lunes, bifaces. The exponential species is simpler and has all its components equal to the base field. Each of these species carries the structure of a bimonoid. Some of them also admit q-analogues. All these bimonoids arise from universal constructions. We also introduce the Lie species and Zie species. These arise as the primitive part of the bimonoids of chambers and faces, respectively. As a consequence, they carry the structure of a Lie monoid.