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[Untitled] edit
One or other of this and cyclic semigroup should be expanded into an article one day. Richard Pinch (talk) 09:35, 22 June 2008 (UTC)
Diagram edit
An example with a diagram like in Howie (1995, p.12) would probably not hurt since this is such an introductory article. Tijfo098 (talk) 02:25, 12 October 2012 (UTC)