In this work we look at how Fitting's embedding of first-order classical logic into first-order S4 can help in reasoning when we are interested in satisfaction "in most cases", when first-order properties are allowed to fail in cases that are considered insignificant. We extend classical semantics by combining a Kripke-style model construction of "significant" events as possible worlds with the forcing-Fitting-style semantics construction by embedding classical logic into S4. We provide various examples. Our main running example is an application to symbolic security protocol verification with complexity-theoretic guarantees. In particular, we show how Fitting's embedding emerges entirely naturally when verifying trace properties in computer security.
@InProceedings{bana_et_al:LIPIcs.CSL.2016.34, author = {Bana, Gergei and Okada, Mitsuhiro}, title = {{Semantics for "Enough-Certainty" and Fitting's Embedding of Classical Logic in S4}}, booktitle = {25th EACSL Annual Conference on Computer Science Logic (CSL 2016)}, pages = {34:1--34:17}, series = {Leibniz International Proceedings in Informatics (LIPIcs)}, ISBN = {978-3-95977-022-4}, ISSN = {1868-8969}, year = {2016}, volume = {62}, editor = {Talbot, Jean-Marc and Regnier, Laurent}, publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik}, address = {Dagstuhl, Germany}, URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.CSL.2016.34}, URN = {urn:nbn:de:0030-drops-65746}, doi = {10.4230/LIPIcs.CSL.2016.34}, annote = {Keywords: first-order logic, possible-world semantics, Fitting embedding, asymptotic probabilities, verification of complexity-theoretic properties} }
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