On finite model property for admissible rules


RYBAKOV V., KIYATKIN V., Oner T.

MATHEMATICAL LOGIC QUARTERLY, cilt.45, ss.505-520, 1999 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 45 Konu: 4
  • Basım Tarihi: 1999
  • Doi Numarası: 10.1002/malq.19990450409
  • Dergi Adı: MATHEMATICAL LOGIC QUARTERLY
  • Sayfa Sayıları: ss.505-520

Özet

Our investigation is concerned with the finite model property (fmp) with respect to admissible rules. We establish general sufficient conditions for absence of fmp w.r.t. admissibility which are applicable to modal logics containing K4: Theorem 3.1 says that no logic lambda containing K4 with the co-cover property and of width > 2 has fmp w.r.t. admissibility. Surprisingly many, if not to say all, important modal logics of width > 2 are within the scope of this theorem - K4 itself, S4, GL, K4.1, K4.2, S4.1, S4.2, GL.2, etc. Thus the situation is completely opposite to the case of the ordinary fmp - the absolute majority of important logics have fmp, but not with respect to admissibility. As regards logics of width I 2, there exists a Bone for fmp w.r.t. admissibility. It is shown (Theorem 4.3) that all modal logics lambda of width I 2 extending S4 which are not sub-logics of three special tabular logics (which is equipotent to all these lambda extend a certain subframe logic defined over S4 by omission of four special frames) have fmp w.r.t. admissibility.