HNN extensions of semigroups
type: Item
instance of: scholarly article
title: HNN extensions of semigroups
zbMATH Open document ID: 0803.20039
DOI: 10.1007/BF02573473
author: Deko V. Dekov
published in: Semigroup Forum
publication date: 1995-01-05T00:00:00Z
full work available at URL: https://eudml.org/doc/135336
review text: The paper gives a new proof of a result of Howie which says that if \(A\) and \(B\) are isomorphic unitary subsemigroups of a semigroup \(S\) then \(S^ 1\) is embeddable in an HNN type extension in which \(A\) and \(B\) are conjugate by virtue of an introduced stable letter \(t\). The proof uses a result of Baer which characterizes those partial groupoids that are semigroup embeddable.
Mathematics Subject Classification ID: 20M07
Mathematics Subject Classification ID: 20M10
zbMATH DE Number: 611117
zbMATH Keywords: HNN extension
zbMATH Keywords: unitary subsemigroups
zbMATH Keywords: partial groupoids
reviewed by: Peter M. Higgins
MaRDI profile type: Publication
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description: scientific article; zbMATH DE number 611117