1 research outputs found
Lifting Term Rewriting Derivations in Constructor Systems by Using Generators
Narrowing is a procedure that was first studied in the context of equational
E-unification and that has been used in a wide range of applications. The
classic completeness result due to Hullot states that any term rewriting
derivation starting from an instance of an expression can be "lifted" to a
narrowing derivation, whenever the substitution employed is normalized. In this
paper we adapt the generator- based extra-variables-elimination transformation
used in functional-logic programming to overcome that limitation, so we are
able to lift term rewriting derivations starting from arbitrary instances of
expressions. The proposed technique is limited to left-linear constructor
systems and to derivations reaching a ground expression. We also present a
Maude-based implementation of the technique, using natural rewriting for the
on-demand evaluation strategy.Comment: In Proceedings PROLE 2014, arXiv:1501.0169