Math & Science ⇒ Integral with extra symbol under it

[Cham]

I need to write an integral with its usual limits, but with an extra symbol just under it.

Take that standard integral for example :

Code: Select all

\int_A^B f(x) \, dx

How can I tell LaTeX to add the text line "path 1" (in small font) just under the integral sign, without changing the limits "A" and "B" ? The text line should be centered with the integral sign.

[cgnieder]

Two possibilities:

Code: Select all

\documentclass{article}
\usepackage[intlimits]{mathtools}
\begin{document}

\[\underset{\text{path 1}}{\int_A^B} f(x) \, dx\]

\[\int_{\substack{A \\\text{path 1}}}^B f(x) \, dx\]

\[\int_{\mathclap{\substack{A \\\text{path 1}}}}^B f(x) \, dx\]

\end{document}

Have a look at mathmode for further information.

[Cham]

Thanks for the answer.

The problem with this solution is that the limits ("A" and "B") are now under and above the integral sign. I would like to leave them in their default position (on the right).

EDIT : Doh ! I just found the solution !

Thanks for your help. Case is solved !

[cgnieder]

That's because of the intlimits option to mathtools. You really should take a look at mathmode.

Code: Select all

\documentclass{article}
\usepackage{mathtools}
\begin{document}

\[\underset{\text{path 1}}{\int_A^B} f(x) \, dx\]

\end{document}

Regards