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seen Sep 17 '10 at 14:15

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answered Examples of great mathematical writing
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comment Graphs and hypercubes
Dear Theo : Yes, there is. I said to you that I am in a category, so every pair of arrows in the hypercubes is composable. For example, you can put the diagram (sorry, I use xymatrix syntax since diagrams in latex are not working in any case, and I am not used to them) X \ar[r]^f \ar[dr]^{gf} & Y \ar[d]^g \\ & Z on the square X \ar[r]^f \ar[dr]^{gf} \ar[d]_f & Y \ar[d]^g \\ Y \ar[r]_g & Z . Dear Andre' : embedding means a functor from I to some hypercube $C_n$ (hypercubes live in an additive category C).
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answered Graphs and hypercubes
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answered Examples of great mathematical writing