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    • Semigroup actions on sets and the burnside ring 

      Erdal, Mehmet Akif; Ünlü, Özgün (Springer Science, 2018)
      In this paper we discuss some enlargements of the category of sets with semigroup actions and equivariant functions. We show that these enlarged categories possess two idempotent endofunctors. In the case of groups these ...