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I was fooling around with string diagrams in a monoidal category and I was thinking about them in terms of chemical reactions. I wondered about bending a wire around and attaching it to the input of the box it came out of. I realized that what I was looking at was a catalyst. I then drew a box with many inputs but only one output and saew that this was an autocatalytic reaction. In this reaction, the product is something necessary for the input. I know that closed loops in the string diagrams are traces. Has anyone seen a paper where traces are seen as catalysts? Has anyone seen work on chemistry using string diagrams in amonoidal category?

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If this exists in the literature, I'm sure John Baez would know about it, cf. e.g. math.ucr.edu/home/baez/rosetta.pdf or try search his blogs. –  Qmechanic Dec 10 '11 at 19:19
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