On divisors of pseudovarieties generated by some classes of full transformation semigroups

Algebra Colloquium, 15 (2008), p. 581–588In this paper we present a division theorem for the pseudovariety of semigroups OD [OR] generated by all semigroups of order-preserving or order-reversing [orientationpreserving or orientation-reversing] full transformations on a finite chain