The termination method of weakly monotonic algebras, which has been defined for higher-order rewriting in the HRS formalism, offers a lot of power, but has seen little use in recent years. We adapt and extend this method to the alternative formalism of algebraic functional systems, where the simply-typed lambda-calculus is combined with algebraic reduction. Using this theory, we define higher-order polynomial interpretations, and show how the implementation challenges of this technique can be tackled. A full implementation is provided in the termination tool Wanda.
@InProceedings{fuhs_et_al:LIPIcs.RTA.2012.176, author = {Fuhs, Carsten and Kop, Cynthia}, title = {{Polynomial Interpretations for Higher-Order Rewriting}}, booktitle = {23rd International Conference on Rewriting Techniques and Applications (RTA'12)}, pages = {176--192}, series = {Leibniz International Proceedings in Informatics (LIPIcs)}, ISBN = {978-3-939897-38-5}, ISSN = {1868-8969}, year = {2012}, volume = {15}, editor = {Tiwari, Ashish}, publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik}, address = {Dagstuhl, Germany}, URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.RTA.2012.176}, URN = {urn:nbn:de:0030-drops-34924}, doi = {10.4230/LIPIcs.RTA.2012.176}, annote = {Keywords: higher-order rewriting, termination, polynomial interpretations, weakly monotonic algebras, automation} }
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