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[Sébastien Brisard <address@hidden>]

Hello (again),

I have now a question regarding the invisible symbols (§3.9 of the manual), a
great feature that is clearly missing in LaTeX.

I understand that the `function application` symbol allows to disambiguate
products in situations like `sin x`, where there are traditionnally no 
brackets
around the argument. How about more standard situations, like `f(x)`? Should I
place a `function application` symbol between `f` and `(`? Semantically, it 
*is*
a function application. However, from the perspective of inter-operation with 
a
programming language, I guess the symbol is not necessary, as `f(x)` would
correctly be interpreted. From the perspective of (beautiful) type-setting, 
this
might be different.

Same question then goes to something like `D²f(x)(δx, δy)` (second 
differential
of `f` at `x`, evaluated for the increments `δx` and `δy`).

Thanks!

Sébastien

---

Sébastien Brisard 


Laboratoire Navier (UMR 8205) 
École des Ponts, Université Gustave Eiffel, CNRS 
F-77455 Marne-la-Vallée 
+33(0)1 64 15 37 51 
[ https://cv.archives-ouvertes.fr/sbrisard | 
https://cv.archives-ouvertes.fr/sbrisard ] 
[ https://sbrisard.github.io/ | https://sbrisard.github.io ]