Geodesic
Non-Specht variety generated by an involution semigroup of order five
Trudy Moskovskogo matematičeskogo obŝestva, Trudy Moskovskogo Matematicheskogo Obshchestva, Tome 81 (2020) no. 1, pp. 105-115

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The non-orthodox $0$-simple semigroup $A_2$ of order five admits a unary operation under which it is an involution semigroup. It is known that $A_2$ generates a Specht variety of semigroups. In contrast, it is shown that as an involution semigroup, $A_2$ generates a non-Specht variety. References: 44 entries. 
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     author = {Edmond W. H. Lee},
     title = {Non-Specht variety generated by an involution  semigroup of order five},
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Edmond W. H. Lee. Non-Specht variety generated by an involution  semigroup of order five. Trudy Moskovskogo matematičeskogo obŝestva, Trudy Moskovskogo Matematicheskogo Obshchestva, Tome 81 (2020) no. 1, pp. 105-115. http://geodesic.mathdoc.fr/item/MMO_2020_81_1_a3/