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Demidirectly closed pseudovarieties of locally trivial semigroups

✍ Scribed by Jorge Almeida

Book ID: 110560468
Publisher: Springer
Year: 1990
Tongue: English
Weight: 387 KB
Volume: 40
Category: Article
ISSN: 0037-1912
DOI: 10.1007/bf02573276

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The aim of this work is to study the unknown intervals of the lattice of aperiodic pseudovarieties which are semidirectly closed and answer questions proposed by Almeida in his book "Finite Semigroups and Universal Algebra". The main results state that the intervals [V \* (B2); ER ∩ LR] and [V \* (B