Concept

Traced monoidal category

Résumé
In , a traced monoidal category is a category with some extra structure which gives a reasonable notion of feedback. A traced symmetric monoidal category is a C together with a family of functions called a trace, satisfying the following conditions: naturality in : for every and , naturality in : for every and , dinaturality in : for every and vanishing I: for every , (with being the right unitor), vanishing II: for every superposing: for every and , yanking: (where is the symmetry of the monoidal category). Every admits a trace. Given a traced monoidal category C, the Int construction generates the free (in some bicategorical sense) compact closure Int(C) of C.
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