# Put R under double integral

When I use $\iint_R f(x,y)dA$ the letter $R$ is to the right of the double integral sign. How to make it under the sign? This is a simple question but I couldn't find a related question.

• @JouleV I managed to mess up the markdown quoting:-), I'll delete and repost the comment, thanks. – David Carlisle Apr 19 '19 at 8:46
• you are using inline mathematics ($) the entire design of the layout for inline math is to make it fit within the normal line spacing of the text in a paragraph so limits move to subscript position, if you need the display style it it best to set it as a math display($...$) – David Carlisle Apr 19 '19 at 8:46 • @DavidCarlisle Thanks a lot! – Haoran Chen Apr 24 '19 at 14:37 ## 2 Answers Apart from JouleV's nice answer, you can use \limits option to typeset the inline with equation with limits under the integral symbol. \documentclass{article} \usepackage{amsmath} \begin{document}$\iint\limits_a f(x,y) dA$\end{document}  to get: • I'd say that \iint\limits_R centers the R term far better than \underset{R}{\iint} does. – Mico Apr 19 '19 at 8:58 • No upper limit should be used when \limits follows a command for multiple integrals. You should also respect the OP’s preference for the differential. – egreg Apr 19 '19 at 9:09 • @egreg I have updated my answer, thanks for the remark. Could you also briefly explain why no upper limit must be used? – Raaja Apr 19 '19 at 9:13 • @Raaja Because they’re badly positioned. – egreg Apr 19 '19 at 9:14 • @egreg Huhh, like that ;) thanks. – Raaja Apr 19 '19 at 9:15 I don't think this is a good idea, but if you want to have it, you can use \underset: \documentclass{standalone} \usepackage{amsmath} \begin{document}$\underset{R}{\iint} f(x,y)dA\$
\end{document}


• Sorry, but this is not the best choice. – egreg Apr 19 '19 at 9:10
• @egreg Yes, it may not be the best, but it surely is a bad one. I will never write like that in my documents – user156344 Apr 19 '19 at 9:19