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Re: The Del operator

  • To: mathgroup at
  • Subject: [mg24743] Re: The Del operator
  • From: Jens-Peer Kuska <kuska at>
  • Date: Wed, 9 Aug 2000 02:31:49 -0400 (EDT)
  • Organization: Universitaet Leipzig
  • References: <8mdm7r$>
  • Sender: owner-wri-mathgroup at

Jack Goldberg wrote:
> Hi,
> If you input  Del[x] you get as output  "inverted-delta"[x].
> I would like to incorporate a similar feature in a package I
> am writing,  to wit,
> The output of  Chi[x,a,b]  should be  "Greek-lowercase chi"[x,a,b].
> This must be very easy but I have not found reading these sections in
> the Book very helpful.  Thanks  ..
> jack


Format[Chi[a_, b_, c_], StandardForm] := "Greek-lowercase chi"[a, b, c]

will do what you want.

The more powerfull and modern version in the FE is

MakeBoxes[Chi[a_, b_, c_], fmt_:StandardForm] :=
    RowBox[{"a strange name with \[Chi] and \[SpaceIndicator] in it",
      ToBoxes[a, fmt], ";", ToBoxes[b, fmt], "|", ToBoxes[c], "]"}]

Hope that helps

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