Lobski, Leo; Zanasi, Fabio; (2023) String Diagrams for Layered Explanations. In: Master, Jade and Lewis, Martha, (eds.) Proceedings of the Fifth International Conference on Applied Category Theory. (pp. pp. 362-382). Open Publishing Association (OPA): Glasgow, Scotland.

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Abstract

We propose a categorical framework to reason about scientific explanations: descriptions of a phenomenon meant to translate it into simpler terms, or into a context that has been already understood. Our motivating examples come from systems biology, electrical circuit theory, and concurrency. We demonstrate how three explanatory models in these seemingly diverse areas can be all understood uniformly via a graphical calculus of layered props. Layered props allow for a compact visual presentation of the same phenomenon at different levels of precision, as well as the translation between these levels. Notably, our approach allows for partial explanations, that is, for translating just one part of a diagram while keeping the rest of the diagram untouched. Furthermore, our approach paves the way for formal reasoning about counterfactual models in systems biology.

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