Re: Nabla operator appears italic in formula

[Xenia <yoraxe@googlemail.com>]

On 24.03.2013 15:17, Hans Hagen wrote:
> On 3/24/2013 12:23 PM, Otared Kavian wrote:
>>
>> On 24 mars 2013, at 11:24, Hans Hagen <pragma@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

Great, thank you!
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________