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The connective of necessity of modal logic S5 is metalogical.
Zdzislaw Dywan
Published in:
Notre Dame J. Formal Log. (1983)
Keyphrases
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modal logic
temporal logic
decision procedures
inference rules
classical logic
epistemic logic
nonmonotonic logics
situation calculus
conditional logic
autoepistemic logic
sequent calculus
background knowledge
initial state
description logic alc