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Vol. 15 No. 4, © The Author, 2005. Published by Oxford University Press. All rights reserved.
Original Articles |
Admissible Rules of Modal Logics
ábekDepartment of Philosophy, Utrecht University, Heidelberglaan 8, 3584 CS Utrecht, The Netherlands. E-mail: jerabek{at}math.cas.cz
We construct explicit bases of admissible rules for a representative class of normal modal logics (including the systems K4, GL, S4, Grz, and GL.3), by extending the methods of S. Ghilardi and R. Iemhoff. We also investigate the notion of admissible multiple conclusion rules.
Keywords: Modal logic, admissible rules, Kripke models, projective formulas
Received 4 January 2005.
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