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Modal: First-Order Modal Sequent Calculus
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This directory contains the Standard ML sources of the Isabelle system for
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Modal Logic. Important files include
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ROOT.ML -- loads all source files. Enter an ML image containing LK
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and type: use "ROOT.ML";
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ex -- subdirectory containing examples. Files, Tthms.ML, S4thms.ML and
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S43thms.ML contain the theorems of Modal Logics, so arranged since
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T<S4<S43. To execute them, enter an ML image containing Modal and type
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use "ex/ROOT.ML";
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Thanks to Rajeev Gore' for supplying the inference system for S43.
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Useful references on Modal Logics:
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Melvin C Fitting,
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Proof Methods for Modal and Intuitionistic Logics (Reidel, 1983)
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Lincoln A. Wallen,
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Automated Deduction in Nonclassical Logics (MIT Press, 1990) |