Sans-serif Greek letters not available with MyriadPro's sansmath

[jhrmnn]

When MyriadPro is loaded with sansmath option, using \mathsf{\alpha} produces serif alpha, even though sans-serif alpha clearly is available when MyriadPro is fully loaded.

[sebschub]

In general and independently of FontPro, \mathsf as well as e.g. \mathbf do not act on greek letters. I adjusted the \boldsymbol command to fit your need:

\documentclass{article}

\usepackage[sansmath]{MyriadPro}

\makeatletter
\DeclareRobustCommand{\sanssymbol}[1]{
  \begingroup
  \let\@nomath\@gobble \mathversion{sans}%
  \math@atom{#1}{%
    \mathchoice%
    {\hbox{$\m@th\displaystyle#1$}}%
    {\hbox{$\m@th\textstyle#1$}}%
    {\hbox{$\m@th\scriptstyle#1$}}%
    {\hbox{$\m@th\scriptscriptstyle#1$}}}%
  \endgroup}
\makeatother

\begin{document}
$\mathsf{a}\mathsf{\alpha}$ $\mathbf{a}\mathbf{\alpha}$ $\sanssymbol{a}\sanssymbol{\alpha}$
\end{document}

[jhrmnn]

I see. Thank you very much for explanation and help!