Changes by: Alexei Kopylov (kopylov at cs.caltech.edu)
Date: 2006-03-31 17:04:16 -0800 (Fri, 31 Mar 2006)
Revision: 8981
Log message:

      Changed definiton of Sequent{'d}. Now the argument of the sequent from Sequent{d} must have the depth d.