Types of mathversions in LaTeX [closed]

Question

I see that on some pages other than Overleaf that use LaTeX for math code (such as Wikipedia as in this picture) has its letters look bolder than those of Overleaf. How can I set mathversion to look like this, I tried \mathversion{bold} but it's too bad.

Answer 1

The text font is Arial (see also using word editor) and the math font is Computern Modern. Compiling with XeLaTeX engine you will have:

\documentclass[a4paper,12pt]{article}
\usepackage{amsmath}
\usepackage{parskip}
\usepackage{fontspec}
\setmainfont{Arial}
\begin{document}
\textbf{Proof.} Recall the standard integral (case of the Gamma function)
\[\int_0^\infty t^je^{-t}dt=j!\]
valid for any natural number $j$. More generally, if $g(t)=\sum_{j=0}^mb_jt^j$ then
\[\int_0^\infty g(t)e^{-t}dt=\sum_{j=0}^mb_jj!.\]
\end{document}

Answer 2

The text font used looks like Roboto, while the math font is the default MathJax TeX math font. I don't think the MathJax TeX .otf fonts can be used in LaTeX as they lack an OpenType Math table. But you can use MLModern fonts, which are similar in look.

% Compile with pdflatex
\documentclass[a4paper,12pt]{article}

\usepackage[sfdefault]{roboto}
\usepackage{mlmodern}

\begin{document}
    \textbf{Proof.} Recall the standard integral (case of the Gamma function)
    \[\int_0^\infty t^je^{-t}dt=j!\]
    valid for any natural number $j$. More generally, if $g(t)=\sum_{j=0}^mb_jt^j$ then
    \[\int_0^\infty g(t)e^{-t}dt=\sum_{j=0}^mb_jj!.\]
\end{document}

A modern alternative are the NewCM fonts, which have a MATH table.

% Compile with LuaLaTeX or XeLaTeX
\documentclass[a4paper, 12pt]{article}

\usepackage{microtype}
\usepackage[newcmbb]{fontsetup}
\setmainfont{Roboto}

\begin{document}
    \textbf{Proof.} Recall the standard integral (case of the Gamma function)
    \[\int_0^\infty t^je^{-t}dt=j!\]
    valid for any natural number $j$. More generally, if $g(t)=\sum_{j=0}^mb_jt^j$ then
    \[\int_0^\infty g(t)e^{-t}dt=\sum_{j=0}^mb_jj!.\]
\end{document}

In case you want a true sans serif font for math, you can try the newly released Noto Sans Math.

\documentclass[a4paper, 12pt]{article}

\usepackage{microtype}
\usepackage{unicode-math}
\setmainfont{Noto Sans}
\setmathfont{NotoSansMath-Regular.otf}
\setmonofont{Noto Sans Mono}

\begin{document}
    \textbf{Proof.} Recall the standard integral (case of the Gamma function)
    \[\int_0^\infty t^je^{-t}dt=j!\]
    valid for any natural number $j$. More generally, if $g(t)=\sum_{j=0}^mb_jt^j$ then
    \[\int_0^\infty g(t)e^{-t}dt=\sum_{j=0}^mb_jj!.\]
\end{document}