(5steps total) PrintForm Definitions Lemmas core StandardLIB Doc
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At: decidable functionality 2
1. P : Prop
2. Q : Prop
3. P  Q
4. Dec(Q)
  Dec(P)
By: Using [`A',Q] (BackThru Thm* Dec(A)  (A  B)  Dec(B))

Generated subgoals:

1   Dec(Q)
Trivial
2   Q  P
1 step

About:
decidablepropimplies
IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html

(5steps total) PrintForm Definitions Lemmas core StandardLIB Doc