Studia Logica

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

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

  • C. Cerrato


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.


Mathematical Logic Computational Linguistic Symmetric Model Canonical Model Normal Logic 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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  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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