IF YOU CAN SEE THIS go to http://www.cs.cornell.edu/Info/People/sfa/Nuprl/Shared/Xindentation_hack_doc.html
At:
implies transitivity P,Q,R:Prop. (PQ) (QR) PR
By:
Unfold `guard` 0 THEN HypBackchain
Generated subgoals:
None
About:
IF YOU CAN SEE THIS go to http://www.cs.cornell.edu/Info/People/sfa/Nuprl/Shared/Xindentation_hack_doc.html
P,Q,R:Prop. (P 
Q) 
