A finitely presented monoid with a non-finitely generated group of units
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We exhibit an example of a monoid defined by finitely many generators and defining relations, the group of units of which is not finitely generated.
Mathematics Subject Classification (2000).20M05 20F05
Keywords.Monoid group unit generators defining relations presentation Bruck–Reilly extension
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© Birkhäuser Verlag Basel/Switzerland 2007