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I have to use the Arial font and I do that as follows (Helvetica is close to Arial):

\renewcommand{\rmdefault}{phv} % Helvetica
\renewcommand{\sfdefault}{phv} % Helvetica

The other solution I have found is to use the commands:

\usepackage{helvet}
\renewcommand{\familydefault}{\sfdefault}

Both work and as far as I can see, both solutions look the same. I use the following packages for math fonts because it looks nice with Arial fonts:

\usepackage[amsthm,mathsfit]{libertinust1math}

I want to modify some font sizes as follows (it looks nice with 1, but it looks nicer with 1.2):

\makeatletter
\newcommand*{\LinuxLibertineT@scale}{1.2}
\makeatother

The issue I have is that the \mathcal fonts are apparently not scalable as far as I understand the problem. Is there any way to overcome the problem ? (I know nothing about fonts sorry)

Philippe Gaucher
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    This isn't Arial font. This is a free substitution of Helvetica. The fonts Helvetica and Arial differ. – wipet Oct 07 '23 at 09:18
  • I've taken the liberty of editing your posting -- specifically, of replacing all instances of "Aria" with "Arial". Incidentally, if you want 12pt instead of 10pt as the default document font size, just specify 12pt as one of the optional arguments of the \documentclass instruction: \documentclass[12pt,...]{...}. – Mico Oct 07 '23 at 09:23
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    @wipet - While technically true, your observation that Helvetica and Arial differ is probably less than helpful for someone who has stated up front to "know nothing about fonts". Arial is a drop-in replacement clone of Helvetica. If not for the shapes of the "R", "t" and "a" glyphs, even many real font experts have to slow down and take a rather close look before being able to tell any difference between Helvetica and Arial. The OP's issue is not with Helvetica not being identical to Arial; instead, it's with an unsuitable math font. – Mico Oct 07 '23 at 09:37
  • @wipet I knew that Arial and Helvetica differ slightly :-). But it does not seem to be possible to install Arial in my Ubuntu computer (after browsing this forum) without a headache and Helvetica is close enough to Arial I think. – Philippe Gaucher Oct 07 '23 at 11:30
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    You don't need to install Arial, just don't call Helvetica Arial. – wipet Oct 07 '23 at 17:16
  • @wipet Okay but I just copy-pasted answers from https://tex.stackexchange.com/q/23957. – Philippe Gaucher Oct 08 '23 at 03:57
  • \renewcommand{\rmdefault}{phv} % Arial has absurd comment, should be \renewcommand{\rmdefault}{phv} % Helvetica. And the answers you pointed include the correct notices about Helvetica. – wipet Oct 08 '23 at 04:05
  • @wipet Did you mean a substitute for Helvetica rather than of? None of this is relevant, but if you want strict accuracy, Helvetica isn't a free substitute for Arial and predates it. Whether Arial is a 'rip off' of Helvetica or an inspired descendant is controversial, but Helvetica was certainly first and commercial. That said, phv is no more Helvetica than it is Arial. Which font you get is extent system-dependent, but most people will get e.g. URW NimbusSanL (uhv) and not Adobe Helvetica (phv). It's true the metrics may differ from those of Arial (but not Helvetica). – cfr Oct 08 '23 at 05:19
  • @cfr My text "it is free substitution of Helvetica" meant that "phv" is linked to a free substitution NimbusSansL of Helvetica without such detail. I am saying that Arial differs from Helvetica, nothing more. Helvetica was designed by Eduard Hoffman in 1957 when phototypesetter technology was. There is many re-implementaion of Helvetica for computers. Non-free Helvetica from Adobe, free NimbusSanL from URW, Heros from TeXGyre and maybe others. I didn't want to dive to such details. I only say that Helvetica isn't Arial which was designed by Robin Nicholas in 1982 and used by Microsoft. – wipet Oct 08 '23 at 06:21
  • @wipet Indeed. That's what I meant by the 'of'/'for' thing ;). – cfr Oct 08 '23 at 16:00

1 Answers1

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In libertinust1math.sty, \mathcal font is stixcal.

\documentclass{article}
\usepackage[amsthm,mathsfit]{libertinust1math}
\makeatletter
\newcommand*{\LinuxLibertineT@scale}{1.2}
\makeatother
\DeclareFontShape{U}{stixcal}{m}{n} {<->s*[1.2]stix-mathcal}{}
\DeclareFontShape{U}{stixcal}{b}{n} {<->s*[1.2]stix-mathcal-bold}{}
\begin{document}
test $t$ $\mathcal{A}$
\end{document}

enter image description here

Clara
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