# 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

$\bigcup\limits_{i=0}^{n}$
Alternatively: $\displaystyle \bigcup_{stuff}$. –  Jubobs Apr 11 '13 at 13:55