2014 | OriginalPaper | Buchkapitel
Confluence by Critical Pair Analysis
verfasst von : Jiaxiang Liu, Nachum Dershowitz, Jean-Pierre Jouannaud
Erschienen in: Rewriting and Typed Lambda Calculi
Verlag: Springer International Publishing
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Knuth and Bendix showed that confluence of a terminating first-order rewrite system can be reduced to the joinability of its finitely many critical pairs. We show that this is still true of a rewrite system
${R_{\textit{T}}} \cup{R_{\textit{NT}}} $
such that
$R_{\textit{T}}$
is terminating and
$R_{\textit{NT}}$
is a left-linear, rank non-increasing, possibly non-terminating rewrite system. Confluence can then be reduced to the joinability of the critical pairs of
$R_{\textit{T}}$
and to the existence of decreasing diagrams for the critical pairs of
$R_{\textit{T}}$
inside
$R_{\textit{NT}}$
as well as for the rigid parallel critical pairs of
$R_{\textit{NT}}$
.