# How to force math symbols up and down inline text

I've a simple question I can't figure out. There should be an option that can force the symbols up and down of a formula put inside text. e.g. If I write

blablabla $\bigcup_{stuff}$ blablabla


the part "stuff" is put on the right side of the symbol instead of down. I would like to force "stuff" to be put under the simbol \bigcup. What do I have to do?

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Welcome to TeX.SX! –  Foo Bar Apr 11 '13 at 13:38
There's a reason why in inline math limits are not set under the operator (\bigcup, \sum or similar): the line becomes too high (or deep) and the page is spoiled. –  egreg Apr 11 '13 at 20:07

Use \limits:

$\bigcup\limits_{i=0}^{n}$


The above ^ and below _ parts may be empty, of course. This works also for \prod and \sum, for example (for all math operators to be exact).

But as mentioned already in the comments: It's not always good to force some output, because the line height could get to big. You have to try with your document because we don't know your settings (font, font size, line height, etc).

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Alternatively: $\displaystyle \bigcup_{stuff}$. –  Jubobs Apr 11 '13 at 13:55
@Jubobs -- using \displaystyle, the \bigcup will be the full display size. the text baselines will be quite uneven just using \limits; \displaystyle will only make the situation worse. –  barbara beeton Apr 11 '13 at 14:25
@barbarabeeton You're right. Apologies. –  Jubobs Apr 11 '13 at 14:36