Abstract
Narrowing is a universal unification procedure for equational theories defined by a canonical term rewriting system. In its original form it is extremely inefficient. Therefore, many optimizations have been proposed during the last years. In this paper, we introduce a new narrowing strategy, called LSE narrowing. LSE narrowing is complete for arbitrary canonical systems. It is optimal in the sense that two different LSE narrowing derivations cannot generate the same narrowing substitution.
The first author's work was supported by the German Ministry for Research and Technology (BMFT) under grant ITS 9103. The second author's work was supported by the Centre National de Recherche Scientifique (CNRS), departement Science pour l'Ingenieur. The third author's work was supported by the Deutsche Forschungsgemeinschaft as part of the SFB 314 (project S2).
This is a preview of subscription content, log in via an institution.
Preview
Unable to display preview. Download preview PDF.
References
P. G. Bosco, E. Giovannetti, and C. Moiso. Narrowing vs. SLD-Resolution. Theoretical Computer Science, 59:3–23, 1988.
A. Bockmayr. Narrowing with inductively defined functions. Technical Report 25/86, Fakultät für Informatik, Univ. Karlsruhe, 1986.
A. Bockmayr. Narrowing with built-in theories. In First Int. Workshop Algebraic and Logic Programming, Gauβig. Springer, LNCS 343, 1988.
J. Darlington and Y. Guo. Narrowing and unification in functional programming — an evaluation mechanism for absolute set abstraction. In Proc. Rewriting Techniques and Applications, Chapel Hill. Springer, LNCS 355, 1989.
R. Echahed. On completeness of narrowing strategies. In Proc. CAAP88, Nancy. Springer, LNCS 299, 1988.
M. Fay. First-order unification in an equational theory. In 4th Workshop on Automated Deduction, Austin, Texas, 1979.
L. Fribourg. Handling function definitions through innermost superposition and rewriting. In Proc. Rewriting Techniques and Applications, Dijon. Springer, LNCS 202, 1985.
A. Herold. Narrowing techniques applied to idempotent unification. SEKI-Report SR-86-16, Univ. Kaiserslautern, 1986.
G. Huet and D. C. Oppen. Equations and rewrite rules, A survey. In R. V. Book, editor, Formal Language Theory. Academic Press, 1980.
S. Hölldobler. Foundations of Equational Logic Programming. Springer, LNCS 353, 1989.
J. M. Hullot. Canonical forms and unification. In Proc. 5th Conference on Automated Deduction, Les Arcs. Springer, LNCS 87, 1980.
S. Krischer and A. Bockmayr. Detecting redundant narrowing derivations by the LSE-SL reducibility test. In Proc. Rewriting Techniques and Applications, Como. Springer, LNCS 488, 1991.
S. Krischer. Vergleich und Bewertung von Narrowing-Strategien. Diplomarbeit, Fakultät für Informatik, Univ. Karlsruhe, 1990.
W. Nutt, P. Réty, and G. Smolka. Basic narrowing revisited. Journal of Symbolic Computation, 7:295–317, 1989.
P. Padawitz. Computing in Horn Clause Theories, volume 16 of EATCS Monograph. Springer, 1988.
P. Réty. Improving basic narrowing techniques. In Proc. Rewriting Techniques and Applications, Bordeaux. Springer, LNCS 256, 1987.
P. Réty. Méthodes d'Unification par Surréduction. PhD thesis, Univ. Nancy, 1988.
P. Réty, C. Kirchner, H. Kirchner, and P. Lescanne. NARROWER: a new algorithm for unification and its application to logic programming. In Proc. Rewriting Techniques and Applications, Dijon. Springer, LNCS 202, 1985.
A. Werner. Termersetzung und Narrowing mit geordneten Sorten. Diplomarbeit, Fakultät für Informatik, Univ. Karlsruhe, 1991.
J. You. Solving equations in an equational language. In First Int. Workshop Algebraic and Logic Programming, Gaußig. Springer, LNGS 343, 1988.
J. You. Unification modulo an equality theory for equational logic programming. J. Comp. Syst. Sc., 42:54–75, 1991.
Author information
Authors and Affiliations
Editor information
Rights and permissions
Copyright information
© 1993 Springer-Verlag Berlin Heidelberg
About this paper
Cite this paper
Bockmayr, A., Krischer, S., Werner, A. (1993). An optimal narrowing strategy for general canonical systems. In: Rusinowitch, M., Rémy, JL. (eds) Conditional Term Rewriting Systems. CTRS 1992. Lecture Notes in Computer Science, vol 656. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-56393-8_39
Download citation
DOI: https://doi.org/10.1007/3-540-56393-8_39
Published:
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-56393-8
Online ISBN: 978-3-540-47549-1
eBook Packages: Springer Book Archive