Varieties of left distributive semigroups

Tomáš Kepka

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A category $K$ is called $α$ -determined if every set of non-isomorphic $K$ -objects such that their endomorphism monoids are isomorphic has a cardinality less than $α$ . A quasivariety $Q$ is called $Q$ -universal if the lattice of all subquasivarieties of any quasivariety of finite type is a homomorphic image of a sublattice of the lattice of all subquasivarieties of $Q$ . We say that a variety $V$ is var-relatively alg-universal if there exists a proper subvariety $W$ of $V$ such that homomorphisms of $V$ whose...

Tight semigroups.

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