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Jan 22, 2015 at 3:34 comment added Michał Masny Numerical monoids are probably the most famous example of a class of commutative cancellative monoids that are not really understood.
Sep 10, 2010 at 1:09 answer added user6976 timeline score: 5
Jun 20, 2010 at 15:28 answer added S. Carnahan timeline score: 7
Jun 20, 2010 at 10:28 answer added Robin Chapman timeline score: 6
Jun 20, 2010 at 8:08 history asked Martin Brandenburg CC BY-SA 2.5