It's in note 11 at http://code.jsoftware.com/wiki/Vocabulary/com#Details
We stuck it in a note because modern code shouldn't be written that way,
and we didn't think there was enough old code around to warrant more
discussion.
Henry rich
On 12/4/2015 11:52 AM, David Lambert wrote:
Is there current documentation for this vestigial quirk? Seeing x & y
without u or v in conjunctions has confused me muchly. The only
documentation I recall has been this sort of anecdotal story---this
being the first explanation making sense to me.
On 12/4/2015 7:11 AM, bill lam wrote:
> It is more accurate to say u v and x y since x y can be used in as
u v in
> the absence of any u v.
>
> of1=: 2 : 'y@[ x y@]'
> Date: Fri, 4 Dec 2015 07:47:31 -0500
> From: Henry Rich<[email protected]>
> To:[email protected]
> Subject: Re: [Jprogramming] My first J conjuction
> Message-ID:<[email protected]>
> Content-Type: text/plain; charset=windows-1252; format=flowed
>
> I would rather say that the implementation has a quirk: it treats the
> names 'x' and 'y' in some cases to refer to u and v. This is a
> regrettable artifact from early J, required to keep old code working,
> and not to be relied on in new code.
>
> Henry Rich
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