Definitions int 2 Sections StandardLIB Doc
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Some definitions of interest.
iffDef P  Q == (P  Q) & (P  Q)
Thm* A,B:Prop. (A  B Prop
int_segDef {i..j} == {k:i  k < j }
Thm* m,n:. {m..n Type
natDef  == {i:| 0i }
Thm*   Type
leDef AB == B<A
Thm* i,j:. (ij Prop
nat_plusDef  == {i:| 0<i }
Thm*   Type

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intnatural_numberless_thansetuniversemember
propimpliesandall!abstraction
IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html

Definitions int 2 Sections StandardLIB Doc