Export Greek font (italic, upright, bold) from 'newtxmath' package with libertine option

by TFra6   Last Updated April 16, 2019 01:23 AM

Is there a way to export just a single symbol from the font used by newtxmath with libertine option? Being be more specific, I would need both the italic and the upright Greek letters (in bold too) without loading the newtxmath package. For instance, this

\documentclass{standalone}
\usepackage[libertine]{newtxmath}
\begin{document}
$\tau\uptau\boldsymbol{\uptau}$
\end{document}

produces that enter image description here How can I export these three characters (respectively italic, upright and bold)? I tried with something like

\DeclareSymbolFont{NEWTXletters}{OML}{ntxmi}{m}{it}
\SetSymbolFont{NEWTXletters}{bold}{OML}{ntxmi}{b}{it}
\DeclareMathSymbol{\newtxtau}{\mathord}{NEWTXletters}{28}

in the preamble, as suggested by @Ruixi Zhang and @Sebastiano and others; that is fantastic, but so I only get the Greek italic letters of the default option, which is not libertine! In newtxmath.sty there is something like DeclareMathSymbol{\tauup}{\mathord}{lettersA}{28}, but I don't know how to export it. Moreover, I tried to export them as .eps files, but that's not the same thing.

Thanks in advance!



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