Proving injectivity of functions via program inversion in term rewriting

  • Authors:
  • Naoki Nishida;Masahiko Sakai

  • Affiliations:
  • Graduate School of Information Science, Nagoya University, Nagoya, Japan;Graduate School of Information Science, Nagoya University, Nagoya, Japan

  • Venue:
  • FLOPS'10 Proceedings of the 10th international conference on Functional and Logic Programming
  • Year:
  • 2010

Quantified Score

Hi-index 0.00

Visualization

Abstract

Injectivity is one of the important properties for functions while it is undecidable in general and decidable for linear treeless functions. In this paper, we show new sufficient conditions for injectivity of functions in term rewriting, which are based on program inversion. More precisely, we show that functions defined by non-erasing, convergent and sufficiently complete constructor rewrite systems are injective if the corresponding inverse-computation rewrite systems generated by the inversion framework are innermost-confluent. By using this property, we also show a syntactic sufficient-condition of injectivity.