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Control theory uses "signal-flow diagrams" to describe processes where real-valued functions of time are added, multiplied by scalars, differentiated and integrated, duplicated and deleted.
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Filippo Bonchi, Paweł Sobociński and Fabio Zanasi, A categorical semantics of signal flow graphs, in CONCUR 2014–Concurrency Theory
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André Joyal and Ross Street, The geometry of tensor calculus II. Draft available at http://maths.mq.edu.au/ ∼ \sim street/GTCII.pdf
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