Titlebook: Lattices, Semigroups, and Universal Algebra; Jorge Almeida,Gabriela Bordalo,Philip Dwinger Book 1990 Springer Science+Business Media New Y

HIKE

引起

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The Join of the Pseudovariety J with Permutative Pseudovarieties,rization of the implict operations on ., we calculate some joins of the form .∨ ., where . is a permutative pseudovariety. As a consequence we obtain that, for these ., . ∨ . is decidable if and only if . ∩ . is decidable.

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GRAZE

Coherent Monoids, functor preserves all embeddings of left S-sets. S is called (.) (., .) . if all (left, right) S-sets are (weakly) flat. Our paper [3] contains results which will be used in the sequel, and is also suggested as a general reference on flatness.

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