Abstract
We present an algebraic characterization of the complexity classes Logspace and NLogspace, using an algebra with a composition law based on unification. This new bridge between unification and complexity classes is inspired from proof theory and more specifically linear logic and Geometry of Interaction.
We show how unification can be used to build a model of computation by means of specific subalgebras associated to finite permutation groups.
We then prove that whether an observation (the algebraic counterpart of a program) accepts a word can be decided within logarithmic space. We also show that the construction can naturally encode pointer machines, an intuitive way of understanding logarithmic space computing.
This work was partly supported by the ANR-10-BLAN-0213 Logoi and the ANR-11-BS02-0010 Récré.
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Aubert, C., Bagnol, M. (2014). Unification and Logarithmic Space. In: Dowek, G. (eds) Rewriting and Typed Lambda Calculi. RTA TLCA 2014 2014. Lecture Notes in Computer Science, vol 8560. Springer, Cham. https://doi.org/10.1007/978-3-319-08918-8_6
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DOI: https://doi.org/10.1007/978-3-319-08918-8_6
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