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when toggle format what by license comment
Apr 7, 2011 at 17:58 comment added Spice the Bird Both categories are in $\mathcal{C}$.
Apr 6, 2011 at 5:57 comment added David Roberts $C_0$ and $C_1$ are subcategories of which category?
Apr 6, 2011 at 4:36 history answered Spice the Bird CC BY-SA 2.5