1994-03-17 lcp 1994-03-17 Improved layout for inductive defs
1993-10-22 lcp 1993-10-22 ZF/ex/tf,tf_fn: renamed the variable tf to f everywhere
1993-10-22 lcp 1993-10-22 sample datatype defs now use datatype_intrs, datatype_elims
1993-10-15 lcp 1993-10-15 ZF/ex/tf/tree,forest_unfold: streamlined the proofs Updated other inductive def examples as per changes in the package.
1993-09-16 clasohm 1993-09-16 Initial revision