Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nominal String Diagrams   We introduce nominal string diagrams as, string diagrams internal in the
category of nominal sets. This requires us to take nominal sets as a monoidal
category, not with the cartesian product, but with the separated product. To
this end, we develop the beginnings of a theory of monoidal categories internal
in a symmetric monoidal category. As an instance, we obtain a notion of a
nominal PROP as a PROP internal in nominal sets. A 2-dimensional calculus of
simultaneous substitutions is an application.

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The categories of this paper are: solv-int
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The categories of this paper are: comp-gas
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The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-ex
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The categories of this paper are: eess
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The categories of this paper are: math-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: mtrl-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-alg
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The categories of this paper are: atom-ph
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The categories of this paper are: math
0
The categories of this paper are: hep-ph
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The categories of this paper are: adap-org