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I am trying to use \prod in math display mode but it appears large (larger than I want it to be) but when I use \mathsmaller from the relsize package the letter appears on right side of it instead of below. Is there any way to make the symbol smaller while the character remains below the symbol?

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Hi Muaz, Welcome to TeX.SE!. Could you provide a MWE? You can use backticks to edit your post to render inline code snippets :) – cmhughes Aug 7 '12 at 20:09
up vote 4 down vote accepted

I don't know the package you mention and you didn't provide an example but using \mathop around the construction will revert to the operator limits positioning.

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Use \mathop{\mathsmaller\prod}_{..}^{..} from relsize. The output is similar to that of \textstyle\prod via \DeclareMathOperator*. – Werner Aug 7 '12 at 20:20
I am still new so cannot post images. thanks – Muaz Aug 7 '12 at 20:25

For consistency, define a new math operator to be set in \textstyle using amsmath's \DeclareMathOperator*:

enter image description here

\usepackage{amsmath}% http://ctan.org/pkg/amsmath
\usepackage{relsize}% http://ctan.org/pkg/relsize
  \prod_{i=1}^{\infty}\ %\frac{1}{i} =
  {\mathsmaller \prod_{i=1}^{\infty}}\ %\frac{1}{i} =
  \sProd_{i=1}^{\infty} %\frac{1}{i}
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