Authors

Inessa Levi

Document Type

Article

Publication Date

2005

Publication Title

Cambridge University Press

Abstract

For a permutation group H on an infinite set X and a transformation / of X, let (/:// ) = ({hfh'1 : h € //)) be a group closure of / . We find necessary and sufficient conditions for distinct normal subgroups of the symmetric group on X and a one-to-one transformation / of X to generate distinct group closures of / . Amongst these group closures we characterize those that are left simple, left cancellative, idempotent-free semigroups, whose congruence lattice forms a chain and whose congruences are preserved under automorphisms.

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Mathematics Commons

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