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Mar 18, 2013 at 13:18 comment added user9072 @Dima Pasechnik: in the answer it is said it is a ring. @Kevin O'Bryant: yes, of course. My comment was basically a joke. (But, as I sketched before your answer in my second comment one could do something like this getting a ring with unity.)
Mar 12, 2013 at 14:56 comment added Kevin O'Bryant This is a ring (just not one with unity). In any case, the OP asked for "an algebraic construction".
Mar 8, 2013 at 3:49 comment added Dima Pasechnik the poster did not ask for a ring...
Mar 7, 2013 at 18:37 comment added user9072 This is not a ring! :-)
Mar 7, 2013 at 18:31 history answered Kevin O'Bryant CC BY-SA 3.0