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[Basile Audoly <address@hidden>]

Hi Sébastien,

I don't think that using a space in f(x) is recommended since there the notation is unambiguous: a multiplication would instead be typeset using * (which gets displayed as a short space).

In my view, the same holds for functions of functions.

Basile

Le 20 déc. 2021 à 06:12, Sébastien Brisard <address@hidden> a écrit :

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
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