Normal Crypto ■-abundant Semigroups
Xiangzhi Kong, Zhiling Yuan · Advances in Mathematics · 2007
Green's relations are generalized to Green's～-relations and the semilattice decomposition of crypto ■-abundant semigroups is given.By using this decomposition,we show that an ■-abundant semigroup is a normal crypto ■-abundant semigroup if and only if it is a strong semilattice of completely ■-simple semigroups.