Using \Mathsmaller in math display mode makes the character appear to the right of the symbol itstead of below it

Question

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?

Answer 1

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.

 \mathop{\mathsmaller.....}_0^n

Answer 2

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

\documentclass{article}
\usepackage{amsmath}% http://ctan.org/pkg/amsmath
\DeclareMathOperator*{\sProd}{\textstyle\prod}
\usepackage{relsize}% http://ctan.org/pkg/relsize
\begin{document}
\[
  \prod_{i=1}^{\infty}\ %\frac{1}{i} =
  {\mathsmaller \prod_{i=1}^{\infty}}\ %\frac{1}{i} =
  \sProd_{i=1}^{\infty} %\frac{1}{i}
\]
\end{document}​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​