Changes by: Xin Yu (xiny at cs.caltech.edu)
Date: 2002-04-02 21:27:01 -0800 (Tue, 02 Apr 2002)
Revision: 3560
Log message:

      Changed the definition of subgroups; fixed the errors in defining the
      operation and equivalence relation for subgroups.
      

Changes	Path
+8 -6	metaprl/theories/czf/czf_itt_subgroup.ml
+1 -1	metaprl/theories/czf/czf_itt_subgroup.mli
+2772 -2238	metaprl/theories/czf/czf_itt_subgroup.prla