We present a generic framework for the specification and reasoning about reduction strategies in the lambda calculus, representable as sets of term decompositions. It is provided as a Coq formalization that features a novel format of phased strategies. It facilitates concise description and algebraic reasoning about properties of reduction strategies. The formalization accommodates many well-known strategies, both weak and strong, such as call by name, call by value, head reduction, normal order, full β-reduction, etc. We illustrate the use of the framework as a tool to inspect and categorize the "zoo" of existing strategies, as well as to discover and study new ones with particular properties.
@InProceedings{biernacka_et_al:LIPIcs.ITP.2022.7, author = {Biernacka, Ma{\l}gorzata and Charatonik, Witold and Drab, Tomasz}, title = {{The Zoo of Lambda-Calculus Reduction Strategies, And Coq}}, booktitle = {13th International Conference on Interactive Theorem Proving (ITP 2022)}, pages = {7:1--7:19}, series = {Leibniz International Proceedings in Informatics (LIPIcs)}, ISBN = {978-3-95977-252-5}, ISSN = {1868-8969}, year = {2022}, volume = {237}, editor = {Andronick, June and de Moura, Leonardo}, publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik}, address = {Dagstuhl, Germany}, URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ITP.2022.7}, URN = {urn:nbn:de:0030-drops-167165}, doi = {10.4230/LIPIcs.ITP.2022.7}, annote = {Keywords: Lambda calculus, Reduction strategies, Coq} }
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