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when toggle format what by license comment
Apr 14, 2016 at 18:43 comment added Lev Borisov I am afraid not.
Apr 14, 2016 at 12:27 comment added Benjamin Steinberg Is this very different than saying it reduces to looking at monoids or do they have combinatorial descriptions?
Apr 14, 2016 at 2:33 history answered Lev Borisov CC BY-SA 3.0