Affiliation:
1. Department of Mathematics, University Gardens, Glasgow, G12 8QW, UK
Abstract
We show that analogues of results from [4, 5] can be obtained if the relation [Formula: see text] is replaced by [Formula: see text]. We also give an example of a semigroup S in which [Formula: see text] does not follow from S being finitely generated, periodic, inverse, E-unitary and not even from the finiteness of its maximal subgroups.
Publisher
World Scientific Pub Co Pte Lt