# integral sign in vs align Why output of \int defer when used in--vs align? How to make output from latter look more like former? \documentclass{article} \usepackage[utf8]{inputenc} \begin{document}\int_V \mu(u,v,w) \,du\,dv\,dw \begin{align} \int_V \mu(u,v,w) \,du\,dv\,dw \end{align} \end{document}  PS: I am typesetting on overleaf. • Welcome! I get the expected size of \int. Please, make a complete example reproducing the issue, from \documentclass to \end{document} Apr 4 '20 at 19:51 • Welcome! You should not use  ...  anyway (and it helps the readers tremendously if differential d's are upright). – user194703 Apr 4 '20 at 19:56 • Are you by any chance comparing \int (one pair of dollars) with the display math version that you get with the align environment? Apr 4 '20 at 19:58 • the left hand version is the inline math with single dollar. Please always post a complete small document that shows the problem, that avoids this kind of error in the question. Apr 4 '20 at 20:55 • @Schrödinger'scat don't let egreg see you ask for upright d, he'll get very cross. Apr 4 '20 at 20:55 ## 1 Answer The problem can be reproduced from your code. However, the LaTeX run shows several errors: ! LaTeX Error: Environment align undefined. See the LaTeX manual or LaTeX Companion for explanation. Type H <return> for immediate help. ... l.6 \begin{align}  After this error, TeX tries to recover as best it can. You need \usepackage{amsmath} in the document preamble. Besides, never use  in LaTeX, see Why is $...$ preferable to $$...$$?

\documentclass{article}
\usepackage{amsmath}

\begin{document}

\begin{equation*}
\int_V \mu(u,v,w) \,du\,dv\,dw
\end{equation*}
Some text in between.
\begin{align}
\int_V \mu(u,v,w) \,du\,dv\,dw
\end{align}

\end{document}