Def P  Q == (P  Q) & (P  Q)

is mentioned by

Thm* i:, A:({i...}Prop). (j:. ij  A(j))  (j:{i...}. A(j))	[int_le_to_int_upper]
Thm* i:, A:({i+1...}Prop). (j:. i<j  A(j))  (j:{i+1...}. A(j))	[int_lt_to_int_upper]

In prior sections: core well fnd

Try larger context: StandardLIB IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html