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On Compositionality of Dinatural Transformations

Authors Guy McCusker , Alessio Santamaria

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Author Details

Guy McCusker
  • University of Bath, United Kingdom
Alessio Santamaria
  • University of Bath, United Kingdom

Funding

  • McCusker, Guy: The author acknowledges the support of EPSRC grant EP/K033042/1.
  • Santamaria, Alessio: The author acknowledges the support of an EPSRC Doctoral Training Partnership studentship at the University of Bath.

Cite AsGet BibTex

Guy McCusker and Alessio Santamaria. On Compositionality of Dinatural Transformations. In 27th EACSL Annual Conference on Computer Science Logic (CSL 2018). Leibniz International Proceedings in Informatics (LIPIcs), Volume 119, pp. 33:1-33:22, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2018)
https://doi.org/10.4230/LIPIcs.CSL.2018.33

Abstract

Natural transformations are ubiquitous in mathematics, logic and computer science. For operations of mixed variance, such as currying and evaluation in the lambda-calculus, Eilenberg and Kelly's notion of extranatural transformation, and often the even more general dinatural transformation, is required. Unfortunately dinaturals are not closed under composition except in special circumstances. This paper presents a new sufficient condition for composability. We propose a generalised notion of dinatural transformation in many variables, and extend the Eilenberg-Kelly account of composition for extranaturals to these transformations. Our main result is that a composition of dinatural transformations which creates no cyclic connections between arguments yields a dinatural transformation. We also extend the classical notion of horizontal composition to our generalized dinaturals and demonstrate that it is associative and has identities.

Subject Classification

ACM Subject Classification
  • Theory of computation → Categorical semantics
  • Theory of computation → Proof theory
Keywords
  • Dinatural transformation
  • categorical logic
  • compositionality

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References

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