Put in minimal simpset to avoid excessive simplification,
just as in revision 1.9 of HOL/indrule.ML
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<H2>LK: Classical First-Order Sequent Calculus</H2>
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
<DL>
<DT>ROOT.ML
<DD>loads all source files. Enter an ML image containing Pure
Isabelle and type: use "ROOT.ML";<P>
<DT>Makefile
<DD>compiles the files under Poly/ML or SML of New Jersey<P>
<DT>ex
<DD>subdirectory containing examples. To execute them, enter an ML image
containing LK and type: use "ex/ROOT.ML";<P>
</DL>
Useful references on First-Order Logic:
<UL>
<LI>Jean Gallier,<BR>
Logic for Computer Science (Harper&Row, 1986)
<LI>G. Takeuti,<BR>
Proof Theory (North Holland, 1987)
</UL>
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