论文信息 - Quasivarieties of Idempotent Semigroups

Quasivarieties of Idempotent Semigroups

It is proved that the lattice L(Bd) of quasivarieties contained in the variety Bd of idempotent semigroups contains an isomorphic copy of the ideal lattice of a free lattice on ω free generators. This result shows that a problem of Petrich [19], which calls for a description of L(Bd), is much more complex than originally expected.

Wieslaw Dziobiak | M. E. Adams

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