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About: String diagram     Goto   Sponge   NotDistinct   Permalink

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Type: yago:WikicatMonoidalCategoriesyago:Abstraction100002137yago:Class107997703yago:Collection107951464yago:Group100031264 New Facet based on Instances of this Class

String diagrams are a formal graphical language for representing morphisms in monoidal categories, or more generally 2-cells in 2-categories. They are a prominent tool in applied category theory. When interpreted in the monoidal category of vector spaces and linear maps with the tensor product, string diagrams are called tensor networks or Penrose graphical notation. This has led to the development of categorical quantum mechanics where the axioms of quantum theory are expressed in the language of monoidal categories.