# Scale/Resize a single letter in mathmode with its subscript/superscript unchanged

Is there a way to do this? Currently I am using something like the following to do the job on scaling of a single letter in an equation:

$\int_{\Omega} (u - \text{\Large \Pi_{\Omega}} u) v \, dx = 0$


or

$\int_{\Omega} (u - \text{\scalebox{1.5}{\Pi_{\Omega}}} u) v \, dx = 0$


and as you can see, the \Omega in the subscript of \Pi is obviously bigger than the \Omega as the domain of the integral sign:

I am curious if there is a way to manually adjust the size of the sub/sup-script of this resized letter? I tried using \scriptsize and \scriptstyle, both seem not working in mathmode? or is there another solution for the rescaling/resizing other than exploiting \text{} or \scalebox{}[]{}. Thanks in advance!

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You're probably looking for \prod\nolimits_{\Omega} –  egreg Mar 21 '12 at 21:28

The "large Pi" symbol you're looking for is called \prod (the analog of \sum for products)

$\int_{\Omega} (u - \prod\nolimits_{\Omega} u) v \, dx = 0$


The \nolimits is to avoid the subscript to go below the symbol in display style.

If you need a smaller symbol in display style, you can define

\newcommand{\sprod}{\mathop{\mathchoice
{\textstyle\prod}
{\prod}
{\prod}
{\prod}
}\nolimits}


and the result of

$\int_{\Omega} (u - \sprod_{\Omega} u) v \, dx = 0$


would be as follows

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Thanks a lot! Works like a charm. –  Shuhao Cao Mar 22 '12 at 2:05