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Stream Processors and Comodels

Author Richard Garner

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Author Details

Richard Garner
  • Department of Mathematics and Statistics, Macquarie University, Sydney, Australia

Funding

  • Garner, Richard: supported by ARC grants FT160100393 and DP190102432.

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Richard Garner. Stream Processors and Comodels. In 9th Conference on Algebra and Coalgebra in Computer Science (CALCO 2021). Leibniz International Proceedings in Informatics (LIPIcs), Volume 211, pp. 15:1-15:17, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021) https://doi.org/10.4230/LIPIcs.CALCO.2021.15

Abstract

In 2009, Ghani, Hancock and Pattinson gave a coalgebraic characterisation of stream processors A^ℕ → B^ℕ drawing on ideas of Brouwerian constructivism. Their stream processors have an intensional character; in this paper, we give a corresponding coalgebraic characterisation of extensional stream processors, i.e., the set of continuous functions A^ℕ → B^ℕ. Our account sites both our result and that of op. cit. within the apparatus of comodels for algebraic effects originating with Power-Shkaravska.

Subject Classification

ACM Subject Classification
  • Theory of computation → Categorical semantics
  • Theory of computation → Automata over infinite objects
Keywords
  • Comodels
  • residual comodels
  • bimodels
  • streams
  • stream processors

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