Studia Logica

, Volume 49, Issue 2, pp 241–252 | Cite as

General canonical models for graded normal logics (graded modalities IV)

  • C. Cerrato
Article

Abstract

We prove the canonical models introduced in [D] do not exist for some graded normal logics with symmetric models, namelyKB°, KBD°, KBT°, so that we define a new kind of canonical models, the general ones, and show they exist and work well in every case.

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References

  1. [B]
    C. Bernardini,Degree thesis, Roma, 1986.Google Scholar
  2. [C]
    B. F. Chellas,Modal Logic; an Introduction, Cambridge Univ. Press, 1980.Google Scholar
  3. [D]
    F. De Caro,Graded modalities, II,Studia Logica 47 (1988), pp. 1–10.Google Scholar
  4. [FC]
    M. Fattorosi-Barnaba andC. Cerrato,Graded modalities, III,Studia Logica 47 (1988), pp. 99–110.Google Scholar
  5. [FD]
    M. Fattorosi-Barnaba andF. De Caro,Graded modalities, I,Studia Logica 44 (1985), pp. 197–221.Google Scholar

Copyright information

© Polish Academy of Sciences 1990

Authors and Affiliations

  • C. Cerrato
    • 1
  1. 1.RomaItaly

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