Not sure about that?
 v=: +
  5 (v~ -: v) 4
1
  5 (-:~v) 4
0

---Devon McCormick wrote:
> or
> -:~v
> ?
>
> Tracy Harms wrote:
> > ...
> > When I read this what immediately popped into my mind was
> the following J
> > statement:
> >
> >   v~ -: v
> >
> > ...
----------------------------------------------------------------------
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