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[Massimiliano Gubinelli <address@hidden>]

You can always define a macro for that if you are bothered by this process. I 
also use this approach to define restriction or when I have to specify limits 
in a integration by parts formula. Semantically I like it since it keeps 
track of the expressions to which the restriction (or substitution) is 
applied.

Max


> On 25. Feb 2021, at 20:13, Frank <address@hidden> wrote:
> 
> Hi,
> 
> I wonder what is the correct way to do that? For the moment, I only know 
> that I can write the thing in the absolute value then delete the first 
> delimiter, which is a bit more difficult since I need to move the cursor 
> back and forth.
> 
> Best wishes,
> Frank
> 
> On 2/24/21, Basile Audoly wrote:
>> Hi Frank,
>> I use a right-hand-side-only delimiter for this purpose.
>> (math (concat (around* "<nobracket>" "q" "|") (rsub "C") "=y"))
>> Basile
>>> Le 24 févr. 2021 à 10:42, Frank <address@hidden <mailto:address@hidden>> 
>>> a écrit :
>>> 
>>> Dear all,
>>> 
>>> I wonder how to input the symbol for restriction of function? Now I 
>>> input, say,
>>> 
>>> (math (concat "q|" (rsub "C") "=y"))
>>> 
>>> which will generate, in my opinion, an incorrect spacing (see the space 
>>> before and after "="). I also suspect that this is semantically incorrect.
>>> 
>>> Best wishes,
>>> Frank