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May 4, 2014 at 18:14 comment added Goldstern Bjarni Jónsson's example is very nice. But it seems to me that the group operation is not necessary; the unary function suffices.
Nov 19, 2010 at 2:01 comment added Gerhard Paseman Looks like I might lose the wager. ALV in chapter 5.1 has a generalized version of the commutative semigroup exercise above, credited to R. McKenzie. (Not to be confused with Robert MacKenzie or John McKinsey.) Gerhard "Betting Windows Are Now Closed" Paseman, 2010.11.18
Nov 18, 2010 at 21:36 comment added Gerhard Paseman I suspect the R is not an R. Even so, there is at least one McKinsey who did some structure theory. I will wager a small amount of money that it is not Ralph McKenzie. Gerhard "Ask Me About System Design" Paseman, 2010.11.18
Nov 17, 2010 at 10:31 vote accept Andrej Bauer
Nov 17, 2010 at 4:18 comment added Gerald Edgar So, I wonder if "R. McKinsey" is "Ralph McKenzie"...
Nov 17, 2010 at 1:09 history edited Gerald Edgar CC BY-SA 2.5
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Nov 17, 2010 at 1:00 history answered Gerald Edgar CC BY-SA 2.5