		LK: Classical First-Order Sequent Calculus

This directory contains the Standard ML sources of the Isabelle system for
First-Order Logic as a classical sequent calculus.  (For a Natural Deduction
version, see FOL.)  Important files include

ROOT.ML -- loads all source files.  Enter an ML image containing Pure
Isabelle and type:    use "ROOT.ML";

Makefile    -- compiles the files under Poly/ML and builds a database
Makefile.NJ -- compiles the files under SML of New Jersey and builds a binary

ex -- subdirectory containing examples.  To execute them, enter an ML image
containing LK and type:    use "ex/ROOT.ML";

For more information about sequent calculi, see the book
	Jean Gallier, Logic for Computer Science (Harper&Row, 1986)

Modal logic??
