Flat unars: the primal, the semi-primal and the dualisable
A flat unar is a semilattice of height one with an additional unary operation. In the paper, the primal, semi-primal and dualisable finite flat unars are characterized. A useful characterization of primality in general is given using an array of techniques from the theory of natural dualities.
scientific article; zbMATH DE number 5818036
scientific article