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Logic Journal of IGPL 2006 14(1):63-71; doi:10.1093/jigpal/jzk004
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© The Author, 2006. Published by Oxford University Press. All rights reserved.

Original Articles

S4 is Topologically Complete for (0,1): a Short Proof

Grigori Mints1

1 Department of Philosophy, Stanford University, USA. E-mail: mints{at}csli.stanford.edu

Ideas of previous constructions are combined into a short proof of topological completeness of modal logic S4 first for rational numbers and after that for real numbers in the interval (0,1).

Key Words: modal logic, topological models, completeness

Received January 30, 2005. Revised June 13, 2005.


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