--- a/src/Modal/README Wed Oct 09 13:38:11 1996 +0200
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,22 +0,0 @@
- Modal: First-Order Modal Sequent Calculus
-
-This directory contains the Standard ML sources of the Isabelle system for
-Modal Logic. Important files include
-
-ROOT.ML -- loads all source files. Enter an ML image containing LK
- and type: use "ROOT.ML";
-
-ex -- subdirectory containing examples. Files, Tthms.ML, S4thms.ML and
-S43thms.ML contain the theorems of Modal Logics, so arranged since
-T<S4<S43. To execute them, enter an ML image containing Modal and type
- use "ex/ROOT.ML";
-
-Thanks to Rajeev Gore' for supplying the inference system for S43.
-
-Useful references on Modal Logics:
-
- Melvin C Fitting,
- Proof Methods for Modal and Intuitionistic Logics (Reidel, 1983)
-
- Lincoln A. Wallen,
- Automated Deduction in Nonclassical Logics (MIT Press, 1990)