A sound and complete equational theory of string diagrams is developed for finite-state transducers, covering both finite and bi-infinite words, with a new canonical normal form for sofic subshifts.
A categorical semantics of signal flow graphs
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Complete Compositional Syntax for Finite Transducers on Finite and Bi-Infinite Words
A sound and complete equational theory of string diagrams is developed for finite-state transducers, covering both finite and bi-infinite words, with a new canonical normal form for sofic subshifts.