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A Combinatorial Approach to Higher-Order Structure for Polynomial Functors

Authors Marcelo Fiore , Zeinab Galal, Hugo Paquet

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LIPIcs.FSCD.2022.31.pdf
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Author Details

Marcelo Fiore
  • University of Cambridge, UK
Zeinab Galal
  • University of Leeds, UK
Hugo Paquet
  • University of Oxford, UK

Funding

  • Fiore, Marcelo: Research partially supported by EPSRC grant EP/V002309/1.
  • Galal, Zeinab: Research partially supported by EPSRC grant EP/V002309/1 and by ANR grant ANR-20-CE48-0010.
  • Paquet, Hugo: Research supported by a Royal Society University Research Fellowship.

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Marcelo Fiore, Zeinab Galal, and Hugo Paquet. A Combinatorial Approach to Higher-Order Structure for Polynomial Functors. In 7th International Conference on Formal Structures for Computation and Deduction (FSCD 2022). Leibniz International Proceedings in Informatics (LIPIcs), Volume 228, pp. 31:1-31:19, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2022) https://doi.org/10.4230/LIPIcs.FSCD.2022.31

Abstract

Polynomial functors are categorical structures used in a variety of applications across theoretical computer science; for instance, in database theory, denotational semantics, functional programming, and type theory. A well-known problem is that the bicategory of finitary polynomial functors between categories of indexed sets is not cartesian closed, despite its success and influence on denotational models and linear logic.
This paper introduces a formal bridge between the model of finitary polynomial functors and the combinatorial theory of generalised species of structures. Our approach consists in viewing finitary polynomial functors as free analytic functors, which correspond to free generalised species. In order to systematically consider finitary polynomial functors from this combinatorial perspective, we study a model of groupoids with additional logical structure; this is used to constrain the generalised species between them. The result is a new cartesian closed bicategory that embeds finitary polynomial functors.

Subject Classification

ACM Subject Classification
  • Theory of computation → Categorical semantics
  • Theory of computation → Lambda calculus
  • Mathematics of computing → Combinatorics
Keywords
  • Bicategorical models
  • denotational semantics
  • stable domain theory
  • linear logic
  • polynomial functors
  • species of structures
  • groupoids

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