On 05/05/2016 11:53 AM, clipka wrote:
> I can only assume that the term "citrus" was introduced as a
> description, not a technical term, and I strongly discourage its use in
> this sense. As a matter of fact, in mathematics the term "citrus" is
> already in use for a different shape.
>
> The proper technical term would be "lemon", while I've been using the
> term "spindle" instead, owing to the fact that it is the inside surface
> of a "spindle torus".

Thanks Christoph. I wrongly assumed it was the citrus surface in use 
with the ovus due the documentation's use of the term. I used for my 
isosurface play the citrus surface equation at:

  http://mathworld.wolfram.com/Lemon.html

not the lemon surface.

Bill P.

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