Identity Bases for Some Non-exact Varieties
Let A2 be the variety generated by the five-element non-orthodox 0-simple semigroup. This paper presents the identity bases for several subvarieties of A2 that are not generated by any completely 0-simple or completely simple semigroups. It will be shown that several subvarieties of A2, including the variety generated by the five-element Brandt semigroup, are hereditarily finitely based.
Lee, Edmond W. H., "Identity Bases for Some Non-exact Varieties" (2004). Mathematics Faculty Articles. 143.