[NTG-context] Nabla operator appears italic in formula
Hans Hagen
pragma at wxs.nl
Sun Mar 24 15:17:15 CET 2013
On 3/24/2013 12:23 PM, Otared Kavian wrote:
>
> On 24 mars 2013, at 11:24, Hans Hagen <pragma at wxs.nl> wrote:
>
>> On 3/23/2013 9:34 PM, Xenia wrote:
>>> Dear context list,
>>>
>>> using the nabla symbol ∇ in formulas, I wondered why it looks italic and
>>> not upright as for example in [1].
>>> I attach an example.
>>
>> Because that's how it's defined in math italics ... is nabla always supposed to be upright in standard math italic mode?
>>
>> (I'll change the \nable definition to \unexpanded\def\nabla{∇}.)
>>
>> Hans
>
> Hi,
>
> \nabla should be italic if all other math greek symbols, like \Omega, \Gamma, \sum, ect are set in italic. Otherwise \nabla and all such symbols should be upright.
> Would it be possible to make this optional in math italics, something like
> \setupmathematics[mathsymbols=italic]
> or
> \setupmathematics[mathsymbols=upright]
> Maybe this should be set when one chooses the greek letters to be italic or upright in mathematics.
That is already there
\setupmathematics
[lcgreek=italic,
ucgreek=normal]
(normal, italic, none)
I've added sygreek so that one can also influence the nable and
differential (default normal). I tested with:
\starttext
\startTEXpage
\startlines
\type{--}: \mathematics{ \nabla \phi = ∇ ϕ = 0}
\type{it}: \mathematics{\it \nabla \phi = ∇ ϕ = 0}
\type{bf}: \mathematics{\bf \nabla \phi = ∇ ϕ = 0}
\type{bi}: \mathematics{\bi \nabla \phi = ∇ ϕ = 0}
\type{tf}: \mathematics{\tf \nabla \phi = ∇ ϕ = 0}
\blank
\type{--}: \mathematics{ \mathgreekupright \nabla \phi =
∇ ϕ = 0}
\type{it}: \mathematics{\it \mathgreekupright \nabla \phi =
∇ ϕ = 0}
\type{bf}: \mathematics{\bf \mathgreekupright \nabla \phi =
∇ ϕ = 0}
\type{bi}: \mathematics{\bi \mathgreekupright \nabla \phi =
∇ ϕ = 0}
\type{tf}: \mathematics{\tf \mathgreekupright \nabla \phi =
∇ ϕ = 0}
\blank
\setupmathematics[sygreek=italic]
\type{--}: \mathematics{ \nabla \phi = ∇ ϕ = 0}
\type{it}: \mathematics{\it \nabla \phi = ∇ ϕ = 0}
\type{bf}: \mathematics{\bf \nabla \phi = ∇ ϕ = 0}
\type{bi}: \mathematics{\bi \nabla \phi = ∇ ϕ = 0}
\type{tf}: \mathematics{\tf \nabla \phi = ∇ ϕ = 0}
\stoplines
\stopTEXpage
\stoptext
Hans
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Hans Hagen | PRAGMA ADE
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