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I'm writing a document with \libertinus font. In order to make the whole document graphically coherent, I'm also using \libertinust1math to write some mathematical formulae. I like the general style, but I'm having a little trouble when I have to typesetting some mathematical expression. Here a MWE:

\documentclass{article}
\usepackage[utf8]{inputenc} %This pack allows to use UTF8 codification for special characters.
\usepackage[T1]{fontenc} %font enconding
\usepackage{comment} %This pack allows for multiple-lines comments.
\usepackage{enumitem} %This pack allows the creation of lists
\usepackage[english]{babel}
\usepackage{geometry} %This pack allows to set margins, paper size and so on.
\usepackage{mathtools} %This pack introduces several powerful math commands that are not provided by basic LaTeX. Mathtools includes amsmath package.
\usepackage{fancyhdr} %It allows some text formatting like chapter on top of each page.
\usepackage{etoolbox} 
\usepackage{array} %It allows tables formatting.
\usepackage{booktabs} %It allows to control the thickness of horizontal rules by toprule, midrule, bottomrule.
\usepackage{graphicx}


\usepackage{libertinus} %font
\usepackage{libertinust1math} %mathfont
\usepackage{microtype} %improves general typographic

\begin{document}

The generic $j$-th sub-interval starts at $t_\mathrm{(j-1)_+}$ and ends at $t_\mathrm{j_-}$

\end{document}

As you can see, I obtain an expression that is not so clear as it should be.

enter image description here

In particular the "t" with subscript doesn't look good, it appears like too close to both "bracket" and "j". Is there a way to make it appear better? Am I using a wrong command? I would like to keep using \libertinust1math(to preserve a certain graphic consistency), anyway if you know other better math-font options that could fit good with libertinus font, I would be happy to consider them.

Thank you!

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  • I would start applying the \mathrm only to symbols, to keep math spacing: $t_{{(\mathrm{j}-1)}_+}$ and maybe adding a bit of space after the (
    – Rmano
    May 28, 2021 at 9:11

2 Answers 2

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I would use the \mathrm only around the symbol (and not rely on it grouping things), and write:

The generic $j$-th sub-interval starts at $t_{{(\mkern1mu\mathrm{j}-1)}_+}$ and ends at $t_{\mathrm{j}_-}$

enter image description here

I did add a bit of space after the opening paren in the subscript to avoid clashing with the long j tail. I still feel that the - in the first subscript is too tight, I do not know why...

With standard (cm) fonts it is:

enter image description here

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  • Inspired by your suggestion @Rmano, I've solved momentarily with this: $t_{{\mkern2mu(\mkern1mu\mathrm{j}-1)}_+}$. In this way I'm able to better control the spacing between "t" and the subscript. It seems to look better.
    – Catarella
    May 28, 2021 at 10:00
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In my pdf the distances are exactly the same with both -, measured from the outline of the j. cm font is slimmer than rm, and maybe because of this its natural spacing looks more spacious. The - in j-1 is centered well, though it does not look so due to the different forms of a j and a 1. Of course you could add \kern0.5pt before the first -, but adjusting all spaces manually, really is quite labourious.

 The generic $j$-th sub-interval starts at
 $t_{{(\kern0.5pt\mathrm{j}\kern0.5pt-1)_+}}$
 and ends at $t_\mathrm{j_-}$

(I prefer kerning by points, but anything could be used here.)

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