Tapes as Stochastic Matrices of String Diagrams

Filippo Bonchi; Cipriano Junior Cioffo

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arXiv · 2601.01472

Tapes as Stochastic Matrices of String Diagrams

Filippo Bonchi·Cipriano Junior Cioffo

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Abstract

Tape diagrams provide a graphical notation for categories equipped with two monoidal products, $\otimes$ and $\oplus$, where $\oplus$ is a biproduct. Recently, they have been generalised to handle Kleisli categories of arbitrary monoidal monads. In this work, we show that for the subdistribution monad, tapes are isomorphic to stochastic matrices of subdistributions of string diagrams. We then exploit this result to provide a complete axiomatisation of probabilistic Boolean circuits.

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Filippo Bonchi, Cipriano Junior Cioffo. 2026-01-04. Tapes as Stochastic Matrices of String Diagrams. https://arxiv.org/abs/2601.01472

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