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We present a functional characterization of deterministic logspace-computable predicates based on a variant (although not a subsystem) of propositional linear logic, which we call parsimonious logic. The resulting calculus is simply-typed and contains no primitive besides those provided by the underlying logical system, which makes it one of the simplest higher-order languages capturing logspace currently known. Completeness of the calculus uses the descriptive complexity characterization of logspace (we encode first-order logic with deterministic closure), whereas soundness is established by executing terms on a token machine (using the geometry of interaction).
@InProceedings{mazza:LIPIcs.CSL.2015.24,
author = {Mazza, Damiano},
title = {{Simple Parsimonious Types and Logarithmic Space}},
booktitle = {24th EACSL Annual Conference on Computer Science Logic (CSL 2015)},
pages = {24--40},
series = {Leibniz International Proceedings in Informatics (LIPIcs)},
ISBN = {978-3-939897-90-3},
ISSN = {1868-8969},
year = {2015},
volume = {41},
editor = {Kreutzer, Stephan},
publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
address = {Dagstuhl, Germany},
URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.CSL.2015.24},
URN = {urn:nbn:de:0030-drops-54053},
doi = {10.4230/LIPIcs.CSL.2015.24},
annote = {Keywords: implicit computational complexity, linear logic, geometry of interaction}
}