This question already has an answer here:

Consider the following integral:

$$\int_{\text{One line \\ Second line}} \text{Loss}\left(\text{Foo, Bar} \vert \alpha\right)$$

which renders:

enter image description here

How can I have One line and Second line on two separate and consecutive lines at the bottom of the integral?

marked as duplicate by Qrrbrbirlbel, Paul Gessler, user31729, yo', user13907 Apr 30 '15 at 20:31

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  • amsmath \substack command – David Carlisle Apr 30 '15 at 19:51
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    Consider also using \[…\] or \begin{align*}…\end{align*} rather than $$. Source : tex.stackexchange.com/q/503/34551 – Clément Apr 30 '15 at 20:17
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    @Clément just FYI, I know you had good intentions with your suggested edit, but I rejected it because the answer likely has the $$ only because the OP had the $$. Your comment here will hopefully help the OP to learn about the differences, and this will be sufficient because the post is a duplicate anyway. In general, when I think an answer should be changed, I simply leave a comment below it and let the author decide. Cheers! – Paul Gessler Apr 30 '15 at 20:30
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    @PaulGessler Thanks for explaining that decision, which is perfectly sensible! – Clément Apr 30 '15 at 23:23

You can use \substack or \subarray from amsmath. With \subarray you can control the justification.

\[ \int_{\substack{\text{One line} \\ \text{Second line}}}
\text{Loss}\left(\text{Foo, Bar} \vert \alpha\right) \]

\[ \int_{\begin{subarray}{l}\text{One line} \\ \text{Second line} \end
{subarray}} \text{Loss}\left(\text{Foo, Bar} \vert \alpha\right) \]

enter image description here

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