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Nov 11, 2009 at 0:39 history edited Peter Arndt CC BY-SA 2.5
added warning at beginning
Nov 11, 2009 at 0:38 comment added Peter Arndt Ok, I leave it, but it really has more flaws than just the cancellativeness issue. To make the semigroup multiplication globally defined (you have to be able to multiply with a given element, no matter in which state you are), you need a special kind of automaton...
Nov 10, 2009 at 20:39 comment added Orr Shalit Thanks. Please don't erase, that's an interesting example and explanation, and somebody might find it useful.
Nov 10, 2009 at 0:40 comment added Jonas Meyer These examples don't appear to be cancellative.
Nov 10, 2009 at 0:26 history answered Peter Arndt CC BY-SA 2.5