Problem with accents in math mode using eulerpx package

Question

The following code

\documentclass{amsart}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{newpxtext,eulerpx}

\begin{document}

$\textsf{á\ â\ ã\ ä}\qquad\mathsf{\acute{a}\ \hat{a}\ \tilde{a}\ \ddot{a}}\qquad\mathsf{\Delta\ \Theta\ \Lambda\ \Xi}$

$\textrm{á\ â\ ã\ ä}\qquad\mathrm{\acute{a}\ \hat{a}\ \tilde{a}\ \ddot{a}}$

\end{document}

has the following output:

As you can see, Roman font poses no problems, unlike Sans Serif font (Greek letters at the right were included just for comparison). Is this a bug from eulerpx package? can this problem be (temporarily) solved with additional code?

Answer 1

Workaround

\documentclass[varwidth=10cm]{standalone} % Replace this!
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{newpxtext, classico, textcomp, eulerpx}

\begin{document}

$\textsf{á\ â\ ã\ ä}\qquad{\acute{\mathsf a}\ \hat{\mathsf a}\ \tilde{\mathsf a}\ \ddot{\mathsf a}}\qquad\mathsf{\Delta\ \Theta\ \Lambda\ \Xi}$

$\textrm{á\ â\ ã\ ä}\qquad\mathrm{\acute{a}\ \hat{a}\ \tilde{a}\ \ddot{a}}$

\end{document}

This sets the sans-serif font to the one recommended for the eulerpx package, classico. It requires getnonfreefonts to install. However, the lowercase a in Palatino (newpx) and Optima (Classico) look very similar to each other, and therefore you might prefer another sans-serif math font if you need to distinguish \mathrm{a} and \mathsans{a}.

In the Modern Toolchain

AMS Euler, Palatino and Optima all have free OpenType clones usable in unicode-math.

\documentclass[varwidth=10cm]{standalone}
\usepackage{mathtools}
\usepackage[math-style=upright]{unicode-math}

\defaultfontfeatures{Scale = MatchLowercase}
\setmainfont{TeX Gyre Pagella}[Scale = 1.0]
\setsansfont{URW Classico}
\setmathfont{Asana Math}
%\setmathfont[range=sfup]{URW Classico}
%\setmathfont[range=bfsfup]{URW Classico Bold}
%\setmathfont[range=sfit]{URW Classico Italic}
%\setmathfont[range=bfsfit]{URW Classico Bold Italic}
\setmathfont[range={up, bfup, cal, bfcal, frak, bffrak}]{Neo Euler}

\begin{document}

\[\textsf{á\ â\ ã\ ä} \qquad
    \symsfup{\acute{a}\ \hat{a}\ \tilde{a}\ \ddot{a}} \qquad
    \symsfup{\Delta\ \Theta\ \Lambda\ \Xi} \hfill
\]
\[
  \textrm{á\ â\ ã\ ä} \qquad
    \mathnormal{\acute{a}\ \hat{a}\ \tilde{a}\ \ddot{a}} \qquad 
    \mathrm{\acute{a}\ \hat{a}\ \tilde{a}\ \ddot{a}}
\]

\end{document}

If you load URW Classico with range=sfup, the placement of your math accents over sans-serif letters will be wrong, so I simply left the default sans-serif math letters from Asana in place. I would suggest defining a different math version for sans-serif math, but (as of March 2019) the range = and version = options of \setmathfont do not work together.