How to use Latin Modern for text and Latin Modern Math for math

Question

How do I switch from the default Computer Modern for text and math to Latin Modern for text and Latin Modern Math for math?

In the preamble I put \usepackage{lmodern} to switch to Latin Modern for text. But what should I add to the preamble so that the document uses Latin Modern Math for math?

The Latin Modern Math download page seems to be for downloading the font for use with MS Word or Adobe or something.

You get also the math fonts, but I recommend also loading fixcmex in order to overcome a glitch of lmodern. — egreg, Nov 05 '21 at 20:52
Try with \sum in a subscript. Do it with amsmath loaded, with and without lmodern. — egreg, Nov 06 '21 at 08:40

score 5 · Accepted Answer · answered Nov 06 '21 at 09:49

If you use pdflatex, then just

\usepackage{lmodern}

will completely replace Computer Modern with Latin Modern for text and math, because its code is

\ProvidesPackage{lmodern}[2015/05/01 v1.6.1 Latin Modern Fonts]
\renewcommand{\rmdefault}{lmr}
\renewcommand{\sfdefault}{lmss}
\renewcommand{\ttdefault}{lmtt}
\DeclareOption{nomath}{\endinput}
\DeclareOption{variablett}{%
  \renewcommand{\ttdefault}{lmvtt}
}
\DeclareOption{lighttt}{%
  \let\lmtt@use@light@as@normal@empty
}
\ProcessOptions\relax
\SetSymbolFont{operators}   {normal}{OT1}{lmr} {m}{n}
\SetSymbolFont{letters}     {normal}{OML}{lmm} {m}{it}
\SetSymbolFont{symbols}     {normal}{OMS}{lmsy}{m}{n}
\SetSymbolFont{largesymbols}{normal}{OMX}{lmex}{m}{n}
\SetSymbolFont{operators}   {bold}  {OT1}{lmr} {bx}{n}
\SetSymbolFont{letters}     {bold}  {OML}{lmm} {b}{it}
\SetSymbolFont{symbols}     {bold}  {OMS}{lmsy}{b}{n}
\SetSymbolFont{largesymbols}{bold}  {OMX}{lmex}{m}{n}
\SetMathAlphabet{\mathbf}{normal}{OT1}{lmr}{bx}{n}
\SetMathAlphabet{\mathsf}{normal}{OT1}{lmss}{m}{n}
\SetMathAlphabet{\mathit}{normal}{OT1}{lmr}{m}{it}
\SetMathAlphabet{\mathtt}{normal}{OT1}{lmtt}{m}{n}
\SetMathAlphabet{\mathbf}{bold}  {OT1}{lmr}{bx}{n}
\SetMathAlphabet{\mathsf}{bold}  {OT1}{lmss}{bx}{n}
\SetMathAlphabet{\mathit}{bold}  {OT1}{lmr}{bx}{it}
\SetMathAlphabet{\mathtt}{bold}  {OT1}{lmtt}{m}{n}
\def\mathsterling{\mathit{\mathchar"70BF}}

However, when used in combination with amsmath it has a problem: with amsmath (and no font package), the largesymbols font is scalable, but with lmodern it becomes fixed size.

Minimal example:

\documentclass{article}
\usepackage{amsmath}
%\usepackage{lmodern}
\begin{document}
[
X_{\sum_i a_i}
]
\end{document}

If you uncomment the \usepackage{lmodern} line you get

which is unacceptable. The usage of a fixed font size for largesymbols has other nasty consequences, so I recommend adding \usepackage{fixcmex} (that was written exactly for solving this problem). It will revert the largesymbols font to Computer Modern, precisely cmex10 and other sizes, but lmex10 is a straightforward copy if cmex10, so there will be essentially no difference.

\documentclass{article}
\usepackage{amsmath}
\usepackage{lmodern}
\usepackage{fixcmex}
\begin{document}
[
X_{\sum_i a_i}
]
\end{document}

Don't load lmodern if you're using XeLaTeX or LuaLaTeX. If you use these engines, the default font is Latin Modern (with Computer Modern for math) even if you don't load fontspec; loading also unicode-math will use Latin Modern Math.

Davislor · Answer 2 · 2021-11-08T14:52:49.500

2

If you want to use the actual font named Latin Modern Math, which is an OpenType font, you need LuaLaTeX or XeLaTeX. Add

\usepackage{unicode-math}

You do not need any other commands or packages. You can, if you feel like it, additionally set

\setmainfont{Latin Modern Roman}
\setsansfont{Latin Modern Sans}
\setmonofont{Latin Modern Mono}
\setmathfont{Latin Modern Math}

However, these are already the default in unicode-math.

You do not need to use lmodern, or any other legacy 8-bit font package, along with unicode-math. All they will do is waste a very tiny amount of time.

edited Nov 08 '21 at 14:52

answered Nov 06 '21 at 05:44

Davislor

44,045

Perfect for Xe- or LuaLaTeX – Ungar Linski Nov 08 '21 at 04:03
@UngarLinski I assumed you literally meant the font named Latin Modern Math. – Davislor Nov 08 '21 at 05:18
I did. I mean that the unicode-math package does not work with pdfLaTeX. It loads and runs perfectly on Xe- or LuaLaTeX. I was not clear in my original post that I was running pdfLaTeX. – Ungar Linski Nov 08 '21 at 14:36

Sebastiano · Answer 3 · 2021-11-05T20:43:47.247

1

Here there is a minimal working example in XeLaTeX and LuaLaTeX. You can see the \mathcal and \mathbb are differents from by default of CM.

\documentclass[12pt]{article}
\usepackage{unicode-math}
\defaultfontfeatures{Scale=MatchLowercase}
\setmathfont{Latin Modern Math}[version=lm]
\begin{document}
This is a short formula
\[abc\sum_{i=0}^Na_i=\mathcal{C}\mathbb{R}\]
\end{document}

Addendum:

In this link you can see the union between Latin modern text and math.

https://tug.org/FontCatalogue/latinmodernroman/

edited Nov 05 '21 at 20:43

answered Nov 05 '21 at 18:19

Sebastiano

54,118

I'm using pdflatex. Does that matter? And the text part of your example is Latin Modern? – Ungar Linski Nov 05 '21 at 18:24
I have not seen the pdfLaTeX tag. Yes of course it is the same of computer modern (CM). – Sebastiano Nov 05 '21 at 18:27
Just to clarify: The text is Latin Modern but the math is Latin Modern Math? – Ungar Linski Nov 05 '21 at 18:32
3

@UngarLinski with pdflatex you just need \usepackage{lmodern} – David Carlisle Nov 05 '21 at 19:16
1

@UngarLinski Yes! It is the same with some differences. You can see my comment to begin of my answer. I add also a related: https://tex.stackexchange.com/questions/25418/use-case-for-latin-modern-math-lm-math – Sebastiano Nov 05 '21 at 20:33

How to use Latin Modern for text and Latin Modern Math for math

3 Answers3

Addendum:

Linked