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Explicit Arguments u.  v.  

The name u. denotes a verb left argument in an explicitly-defined adverb or conjunction, and the name v. denotes a verb right argument in an explicitly-defined conjunction. See the names m. n. x. y. and Explicit Definition (:).
 

For example:
pow=: 2 : 0
 i=.0
 t=.]
 while. n.>i do.                Uses n. (noun right argument)
  i=.1+i
  t=.u.@t f.                    Uses u. (verb left argument)
 end.
)

   o. pow 2
o.@(o.@])
   o. pow 3
o.@(o.@(o.@]))

   o. pow 3 x=: 1
31.0063
   o.^:3 x
31.0063

   o. pow +
|value error: n.
|       n.>i


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