Semigroups and Their Subsemigroup Lattices by L.N. Shevrin, A.J. Ovsyannikov.
0.1. General remarks. For any algebraic system A, the set SubA of all subsystems of A partially ordered by inclusion forms a lattice. This is the subsystem lattice of A. (In certain cases, such as that of semigroups, in order to have the right always to say that SubA is a lattice, we have to treat t...
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