2

What package or command should I use to achieve this (bolded?) style of LaTeX math?

enter image description here

Instead of this (regular) style. I know the color is gray in this second picture, but the style is completely different.

enter image description here

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    Somewhat close... \documentclass{article} \usepackage{txfonts,bm} \begin{document} \[ \bm{\sum_{n=1}^\infty} \] \end{document} – Steven B. Segletes Aug 13 at 17:28
  • @Steven B. Segletes Please post as an answer. – hesham Aug 13 at 17:53
6

I don't think it's a group of bold math-font glyphs you're looking at. Instead, it appears to be a regular-weight \sum symbol produced by the stix package.

enter image description here

\documentclass{article} 
\usepackage{stix} % Times Roman clone
\begin{document} 
$\displaystyle \sum_{n=1}^\infty $
\end{document}
| improve this answer | |
  • 1
    Looks like I had installed the STIX fonts years ago and the browser rendered the math with those for my local file! I was able to confirm by right-clicking the math and looking at the MathJax settings. Thanks! – zerosofthezeta Aug 13 at 18:36
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    Aside: The 5th upvote on this answer brought my overall rep count on TeX.SE to exactly 353,353 points. :-) – Mico Aug 14 at 6:25

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