Nabla operator appears italic in formula

Nabla operator appears italic in formula

[Xenia]

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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.

Thanks,
Xenia

[1] https://en.wikipedia.org/wiki/Nabla_symbol

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\starttext
\startformula
\nabla \phi = ∇ ϕ = 0
\stopformula
\stoptext


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Re: Nabla operator appears italic in formula

[Hans Hagen]

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

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
     tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
                                              | www.pragma-pod.nl
-----------------------------------------------------------------
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Re: Nabla operator appears italic in formula

[Otared Kavian]

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.

Best regards: OK
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Re: Nabla operator appears italic in formula

[Hans Hagen]

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


Hans


-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
     tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
                                              | www.pragma-pod.nl
-----------------------------------------------------------------
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___________________________________________________________________________________

Re: Nabla operator appears italic in formula

[Xenia]

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!
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