Bondarenko, V.M.; Zaciha, Y.V.
(Algebra and Discrete Mathematics, 2015)
Let K be a class of semigroups and P be a set of general properties of semigroups. We call a subset Q of P cha\-racteristic for a semigroup S∈ K if, up to isomorphism and anti-isomorphism, S is the only semigroup in ...