Nominal Renaming Sets

  • Authors:
  • Murdoch J. Gabbay;Martin Hofmann

  • Affiliations:
  • No Affiliations,;No Affiliations,

  • Venue:
  • LPAR '08 Proceedings of the 15th International Conference on Logic for Programming, Artificial Intelligence, and Reasoning
  • Year:
  • 2008

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Abstract

Nominal techniques are based on the idea of sets with a finitely-supported atoms-permutation action. We consider the idea of nominal renaming sets , which are sets with a finitely-supported atoms-renaming action; renamings can identify atoms, permutations cannot. We show that nominal renaming sets exhibit many of the useful qualities found in (permutative) nominal sets; an elementary sets-based presentation, inductive datatypes of syntax up to binding, cartesian closure, and being a topos. Unlike is the case for nominal sets, the notion of names-abstraction coincides with functional abstraction. Thus we obtain a concrete presentation of sheaves on the category of finite sets in the form of a category of sets with structure.