LCF: Logic for Computable FunctionsThis directory contains the Standard ML sources of the Isabelle system forLCF. It is loaded upon FOL, not Pure Isabelle. Important files includeROOT.ML -- loads all source files. Enter an ML image containing FOL andtype: use "ROOT.ML";Makefile -- compiles the files under Poly/ML or SML of New Jerseyex.ML -- files containing examples. To execute them, enter an ML imagecontaining LCF and type: use "ex.ML";Useful references on LCF: Lawrence C. Paulson, Logic and Computation: Interactive proof with Cambridge LCF (CUP, 1987)