Non-Specht variety generated by an involution semigroup of order five
Transactions of the Moscow Mathematical Society
Semigroup, involution, variety, finitely based, Specht variety
The non-orthodox 0-simple semigroup A2 of order five admits a unary operation under which it is an involution semigroup. It is known that A2 generates a Specht variety of semigroups. In contrast, it is shown that as an involution semigroup, A2 generates a non-Specht variety.
Lee, Edmond W. H., "Non-Specht variety generated by an involution semigroup of order five" (2020). Mathematics Faculty Articles. 308.