is mentioned by

Def abs_num == n:. @m:. (n = rep_num(m)  )	[habs_num]
Def zero_rep == @x:. (y:. x = suc_rep(y)  )	[hzero_rep]
Def suc_rep == x:. (@f:. (one_one(;;f) & onto(;;f)))(x)	[hsuc_rep]

In prior sections: hol hol min

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