Awkward spacing with some operators and paired delimiter

[Enivex]

If I define \DeclarePairedDelimiter{\brak}{\lbrack}{\rbrack} then spacing will often be way to cramped (in my opinion) between operators and large versions of the delimiter.

\lim_{n\to \infty}\brak*{\int_0^\infty}\quad \sum_{n\to \infty}\brak*{\int_0^\infty}

displays as

The reason for this is obviously the \mathopen in the definition. Which is great for operators like \sin, but not so great in these cases (in my opinion). I much prefer to do something like

\lim_{n\to \infty}{}\brak*{\int_0^\infty}\quad \sum_{n\to \infty}{}\brak*{\int_0^\infty}

which displays as

The $n \to \infty$ and $n=0$ are no longer uncomfortably close to the delimiter.

My question is: Is there a better way to handle this than having to manually add {} to add space in these cases?

(This also happens with other delimiters, but I chose brackets to illustrate the issue)

[davidcarlisle]

I'd say this is by design, although rather than add {} each time you could adjust the definition

\DeclarePairedDelimiter{\brakinner}{\lbrack}{\rbrack}
\newcommand\brak{{}\brakinner}

[Enivex]

I could do that, but it doesn't change the fact that I would have to manually use different versions depending on context.

After thinking about it, I think I'd want the space for any operator with limits set above and below in display math (i.e. sum, lim, anything defined with \DeclareMathOperator*}. Would it be possible to achieve something like that automatically?

Edit: Alternatively I'll have to learn to like the default spacing.

[juhaszp95]

Hello,

Somewhat related to this (although not exactly) is that I get awkward spacing when using Libertinus with mathtools. Consider the following MWE (in LuaTeX):

\documentclass[12pt]{article}
\usepackage{libertinus-otf}

\usepackage{mathtools}
\DeclarePairedDelimiter{\abs}{\lvert}{\rvert}

\begin{document}
    $c\lvert c \rvert \ c\abs{c} \ c\abs*{c}$
\end{document}

I get the following output:

Notice how the spacing is off in the last case, and c comes very close to colliding with |. I'm not sure if this is a font issue or a mathtools issue, but given the spacing is different between the starred and non-starred version of the command, I thought it might be the latter.

[daleif]

First of, please don't hijack questions (make your own issue). Secondly the problem is also present without mathtools: $c\lvert c \rvert\quad \left\lvert c \right\rvert$ so I don't think this has anything to do with mathtools.

[daleif]

As David mentioned the \mathopen is by design. Will not be changed,