Sans-serif bold math with newtxmath

Question

I'm writing an article whose math font needs to be Times New Roman. To this end, I'm using the newtxmath package. However, it doesn't seem to support sans-serif bold in math mode.

Usually I can write

\documentclass{article}

\usepackage{amssymb}
\usepackage{amsmath}
\usepackage{amsfonts}

\begin{document}

Sans serif, no bold: $\mathsf{A}, \mathsf{\Omega}$

Sans serif, bold: $\boldsymbol{\mathsf{A}}, \boldsymbol{\mathsf{\Omega}}$

\end{document}

which produces

However, when the newtxmath is included

\documentclass{article}

\usepackage{amssymb}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{newtxmath}

\begin{document}

Sans serif, no bold: $\mathsf{A}, \mathsf{\Omega}$

Sans serif, bold: $\boldsymbol{\mathsf{A}}, \boldsymbol{\mathsf{\Omega}}$

\end{document}

one gets

Is there any workaround to this? Using mathptmx instead isn't the best option, since I also need upright Greek symbols which are provided automatically in newtxmath.

Answer 1

You should also load newtxtext, for the text fonts. A small correction should be made as well, for \mathsf{\Omega}. Also load bm, which is better than the standard version for \boldsymbol provided by amsmath. You can also use \bm instead of \boldsymbol.

\documentclass{article}

\usepackage{amsmath}
\usepackage{bm}
\usepackage{newtxtext,newtxmath}

\DeclareMathAlphabet{\mathsf}{OT1}{\sfdefault}{m}{n}
\SetMathAlphabet{\mathsf}{bold}{OT1}{\sfdefault}{b}{n}


\begin{document}

Sans serif, no bold: $\mathsf{A}, \mathsf{\Omega}$

Sans serif, bold: $\boldsymbol{\mathsf{A}}, \boldsymbol{\mathsf{\Omega}}$

\end{document}