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<HTML><HEAD><TITLE>Modal/ReadMe</TITLE></HEAD><BODY>
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<H2>Modal: First-Order Modal Sequent Calculus</H2>
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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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<DL>
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<DT>ROOT.ML
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<DD>loads all source files. Enter an ML image containing LK
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Isabelle and type: use "ROOT.ML";<P>
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<DT>ex
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<DD>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
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and type: use "ex/ROOT.ML";
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</DL>
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Thanks to Rajeev Gore' for supplying the inference system for S43.<P>
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Useful references on Modal Logics:
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<UL>
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<LI>Melvin C Fitting,<BR>
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Proof Methods for Modal and Intuitionistic Logics (Reidel, 1983)
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<LI>Lincoln A. Wallen,<BR>
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Automated Deduction in Nonclassical Logics (MIT Press, 1990)
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</UL>
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</BODY></HTML>
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