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At: not over or a
  A,B:Prop. (A  B)  A & B
By: Unfold `guard` 0 THEN Lemma Thm* (A  B)  A & B

Generated subgoals:

None

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propandorall
IF YOU CAN SEE THIS go to http://www.cs.cornell.edu/Info/People/sfa/Nuprl/Shared/Xindentation_hack_doc.html

PrintForm Definitions Lemmas core StandardLIB Search Doc