Definitions int 2 Sections StandardLIB Doc
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Some definitions of interest.
absvalDef |i| == if 0i i else -i fi
Thm* x:. |x 
iffDef P  Q == (P  Q) & (P  Q)
Thm* A,B:Prop. (A  B Prop
natDef  == {i:| 0i }
Thm*   Type
leDef AB == B<A
Thm* i,j:. (ij Prop

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ifthenelseintnatural_numberminusless_thanset
universememberpropimpliesandall!abstraction
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Definitions int 2 Sections StandardLIB Doc