THE PSEUDOVARIETY GENERATED BY ALL SEMIGROUPS OF ORIENTATION-PRESERVING TRANSFORMATIONS ON A FINITE CYCLE
Paula Catarino, Peter M. Higgins · International Journal of Algebra and Computation · 2002
We continue the study of OPn, the monoids of orientation-preserving mappings on a chain, leading to the study of the semigroup pseudovariety [Formula: see text] generated by all monoids OPn, showing among other results that [Formula: see text] is self-dual and contains all commutative semigroups.