# How to Obtain a Bold Upright Integral Sign?

Having searched around I couldn't find a package that could produce the following integral sign.

How do I produce this bold looking vertical symbol? Xe-/LuaTeX are totally fine with me.

\documentclass{article}
\begin{document}
$\int_a^b$
\end{document}

• What size do you want? If you want to center a formula just use $\int_{min}^{max} f(x) dx$ for example. Jan 8 '15 at 10:03
• Times truetype font
– yolo
Jan 8 '15 at 10:23
• Yes XeTeX and LuaTeX
– yolo
Jan 8 '15 at 10:35
• Possible duplicate of Load integral sign from eulervm Dec 8 '16 at 19:30

With Lua- or XeLaTeX you can use the package unicode-math and substitute single symbols easily. Just download any font you like and use it like:

% arara: lualatex

\documentclass{article}
\usepackage{unicode-math}
\setmathfont{Latin Modern Math}
\setmathfont[range="222B]{Linux Libertine O} % or any font you like

\begin{document}
$\int_{a}^{b}\displaystyle\int_{a}^{b}\int\limits_{a}^{b}$
\end{document}


Other fonts for this case. You might want to replace the other integral signs as well. Linux Libertine covers U+222B to U+222E.

% arara: lualatex

\documentclass{article}
\usepackage{unicode-math}
\setmathfont{Latin Modern Math}
\setmathfont[range={"222B-"2230}]{Linux Libertine O}

\begin{document}
$\int\iint\iiint\oint$
\end{document}


• Have to use this in a math environment. Currently using mathptmx but symbols are being produced using CM
– yolo
Jan 8 '15 at 10:12
• I could not get it to load using \DeclareSymbolFont{fnt}{T1}{libertine}{m}{n} \DeclareMathSymbol{\intop}{\mathop}{fnt}{"222B}
– yolo
Jan 8 '15 at 11:49
• Error Limit controls must follow a math operator $\int – yolo Jan 8 '15 at 11:53 • @yolo please see my update. Jan 8 '15 at 12:15 • Thanks, I am able to produce these symbols but for some odd reason other symbols like \infty or \lambda are not appearing now. Any idea why. Just use the code you just gave me and try a symbol outside the range. – yolo Jan 8 '15 at 15:37 Employing a variation of my answer at Integral Sign$\int...$, I define a new operator \uint and show the comparison to \int in the MWE below. This approach takes a traditional \scriptstyle integral sign, rotates it 8 degrees, and scales it up to the same vertical extent as a normal integral sign when employed in the current mathstyle. \documentclass{article} \usepackage{amsmath} \DeclareMathOperator*{\uint}{\scalerel*{\rotatebox{8}{$\!\scriptstyle\int\!$}}{\int}} \usepackage{scalerel} \usepackage{graphicx} \parskip 1ex \begin{document} $f=\int_0^t A d\tau =\uint_0^t A d\tau$ \centering $$f=\int_0^t A d\tau =\uint_0^t A d\tau$$\par $$\scriptstyle f=\int A d\tau =\uint A d\tau$$\par $$\scriptscriptstyle f=\int A d\tau =\uint A d\tau$$ \end{document}  If the integral sign is perceived as just a bit too bold, then the we can scale a \textstyle integral sign instead: \DeclareMathOperator*{\uint}{\scalerel*{\rotatebox{8}{$\!\textstyle\int\!\$}}{\int}}
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