The Gap Between Partial and Full

Author:

Almeida J.1,Volkov M. V.2

Affiliation:

1. Departamento de Matemática Pura, Faculdade de Ciências, Universidade do Porto, 4050 Porto, Portugal

2. Department of Mathematics and Mechanics, Ural State University, 620083 Ekaterinburg, Russia

Abstract

We show that the interval of the lattice of semigroup pseudovarieties between the pseudovarieties generated by all semigroups of full and respectively, partial, order-preserving transformations of a finite chain, contains a chain isomorphic to the chain of real numbers (with the usual order). Similar results are proved for several related intervals.

Publisher

World Scientific Pub Co Pte Lt

Subject

General Mathematics

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