The globals of pseudovarieties of ordered semigroups containing $B_2$ and an application to a problem proposed by Pin

Almeida, Jorge; Escada, Ana P.

RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 39 (2005) no. 1, pp. 1-29.

Given a basis of pseudoidentities for a pseudovariety of ordered semigroups containing the 5-element aperiodic Brandt semigroup $B_2$, under the natural order, it is shown that the same basis, over the most general graph over which it can be read, defines the global. This is used to show that the global of the pseudovariety of level $3/2$ of Straubing-Thérien’s concatenation hierarchy has infinite vertex rank.

Classification : 20M05, 20M07, 20M35
Mots clés : semigroup, pseudovariety, semigroupoid, category, pseudoidentity, dot-depth, concatenation hierarchies

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