Normalisation for higher-order calculi with explicit substitutions

  • Authors:
  • Eduardo Bonelli

  • Affiliations:
  • LIFIA, Facultad de Informática, Universidad-Nacional de La Plata, La Plata, Buenos Aires, Argentina and Department of Computer Science, Stevens Institute of Technology, Hoboken, NJ

  • Venue:
  • Theoretical Computer Science - Foundations of software science and computation structures
  • Year:
  • 2005

Quantified Score

Hi-index 0.00

Visualization

Abstract

Explicit substitutions (ES) were introduced as a bridge between the theory of rewrite systems with binders and substitution, such as the λ-calculus, and their implementation. In a seminal paper Melliès observed that the dynamical properties of a rewrite system and its ES-based implementation may not coincide: he showed that a strongly normalising term (i.e. one which does not admit infinite derivations) in the λ-calculus may lose this status in its ES-based implementation. This paper studies normalisation for the latter systems in the general setting of higher-order rewriting: Based on recent work extending the theory of needed strategies to non-orthogonal rewrite systems we show that needed strategies normalise in the ES-based implementation of any orthogonal pattern higher-order rewrite system.