Changes by: Xin Yu (xiny at cs.caltech.edu)
Date: 2006-01-04 17:26:50 -0800 (Wed, 04 Jan 2006)
Revision: 8397
Log message:

      Completed proofs in Itt_hoas_bterm_wf. However, I added a well-formedness
      subgoal (subterms in List) to mk_bterm_wf_forward. Does it matter?