# doubled letter when I using \bm

When I using the \bm package, all the letters are overprinting like below.

I could not find the problem.

• Provide an example that compiles, please. Welcome to the site. Apr 4 '18 at 20:14
• That is bm's last resort "poor man's bold" which it does if there are no bold fonts available. What font are you using? Is there a bold font? Apr 4 '18 at 20:20

\documentclass{article}
\usepackage{mathptmx}
\usepackage{bm}

\begin{document}

$\hat{\bm{R}}$

\end{document}

You essentially cannot use bm with mathptmx.

Solution: use newtx:

\documentclass{article}
\usepackage{newtxtext,newtxmath}
\usepackage{bm}

\begin{document}

$\hat{\bm{R}}$

\end{document}

• Thank you! 1. I don't use \usepackage{mathptmx}. so I am not sure it is the reason. 2. when I add \usepackage{newtxtext,newtxmath} An error appear: Option clash for package textcomp. \DeclareRobustCommand Too many math alphabets used in version normal. \begin{document} Apr 5 '18 at 21:15

In the template, there are three fonts could be choose:

1.times' : Times font with math support.

2.fourier': Utopia Font with Fourier Math font (Font has to be installed) It's a free font.

3.customfont': Usecustomfont' option in the document class and load the package in the preamble.tex

1. default or leave empty: `Latin Modern' font will be loaded. If I use "times" the problem appears,

but If I use "fourier" and "Latin Modern" the problem solved. Maybe because I don't have the bold fonts for "times" and I don't know which bold fonts corresponding to "times" and how to add it.