A proof of weak termination providing the right way to terminate
Identifieur interne : 007499 ( Main/Merge ); précédent : 007498; suivant : 007500A proof of weak termination providing the right way to terminate
Auteurs : Olivier Fissore [France] ; Isabelle Gnaedig [France] ; Hélène Kirchner [France]Source :
English descriptors
Abstract
We give an inductive method for proving weak innermost termination of rule-based programs, from which we automatically infer, for each successful proof, a finite strategy for data evaluation. We first present the proof principle, using an explicit induction on the termination property, to prove that any input data has at least one finite evaluation. For that, we observe proof trees built from the rewrite system, schematizing the innermost derivations of any ground term. These proof trees are issued from patterns representing sets of ground terms. They are built using two mechanisms, namely abstraction, introducing variables that represent ground terms in normal form, and narrowing, schematizing rewriting on ground terms. Then, we show how, for any ground term, a rewriting strategy to compute one of its normal forms can be extracted from the proof trees, even if the ground term admits infinite rewriting derivations.
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<front><div type="abstract" xml:lang="en">We give an inductive method for proving weak innermost termination of rule-based programs, from which we automatically infer, for each successful proof, a finite strategy for data evaluation. We first present the proof principle, using an explicit induction on the termination property, to prove that any input data has at least one finite evaluation. For that, we observe proof trees built from the rewrite system, schematizing the innermost derivations of any ground term. These proof trees are issued from patterns representing sets of ground terms. They are built using two mechanisms, namely abstraction, introducing variables that represent ground terms in normal form, and narrowing, schematizing rewriting on ground terms. Then, we show how, for any ground term, a rewriting strategy to compute one of its normal forms can be extracted from the proof trees, even if the ground term admits infinite rewriting derivations.</div>
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